OK here are the plugins I use, I recomend adding them even if you do not know what they are or how to use them they will not hurt your site!
Add To Facebook
Adds a footer link to add the current post or page to a Facebook Mini-Feed.
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Version 1.4.3 | By David Goldstein | Visit plugin site
Advanced Text Widget
Text widget that has extensive conditional options to display content on pages, posts, specific categories etc. It supports regular HTML as well as PHP code. This widget is an extension of Daiko’s Text Widget by Rune Fjellheim.
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Version 1.0.4 | By Max Chirkov
Akismet
Akismet checks your comments against the Akismet web service to see if they look like spam or not. You need a WordPress.com API key to use it. You can review the spam it catches under “Comments.” To show off your Akismet stats just put <?php akismet_counter(); ?> in your template. See also: WP Stats plugin.
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Version 2.2.7 | By Matt Mullenweg | Visit plugin site
All in One Adsense and YPN
Inserts Adsense or YPN code in to your blog posts. Ad position can be random or pre-defined. To configure this plugin go to “Settings->Adsense” menu.
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Version 1.84 | By linewbie | Visit plugin site
All in One SEO Pack
Out-of-the-box SEO for your WordPress blog. Options configuration panel | Upgrade to Pro Version | Donate | Support | Amazon Wishlist
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Version 1.6.10 | By Michael Torbert | Visit plugin site
Audio player
Audio Player is a highly configurable but simple mp3 player for all your audio needs. You can customise the player’s colour scheme to match your blog theme, have it automatically show track information from the encoded ID3 tags and more. Go to your Settings page to start configuring it.
Settings | Deactivate | Edit
Version 2.0.2 | By Martin Laine | Visit plugin site
Auto Keywords and Description Generator
Auto create Keywords and description meta tags from blog post information
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Version 1.3.1 | By Michael E. Chancey Jr. | Visit plugin site
banner
Advertise banner plugin
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Version 0.6.1 | By Alfredo Cubitos | Visit plugin site
bestflashgames
Best Flash Games provides over 350 free online games for your Site..
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Version 1.0 | By Nuh Keles | Visit plugin site
Business Directory
The Business Directory plugin for WordPress is an easy way to host a free directory page for your readers, affiliates, advertisers, community, club members, etc. Allow them to submit a simple advertisement listing for themselves on your blog.
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Version 0.8.4 Beta | By Square Compass | Visit plugin site
Comments Needed
Remind one-time visitors to leave some comments.
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Version 0.1 | By HD@THU | Visit plugin site
Complete Site Stats
Complete statistics for your blog.
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Version 0.1 | By George Pearce | Visit plugin site
Content Slide Plugin
WordPress plugin for simple slideshow.
Activate | Edit | Delete
Version 1.0 | By Snilesh | Visit plugin site
There is a new version of Content Slide Plugin available. View version 1.2 Details or upgrade automatically.
Dagon Design Sitemap Generator
Generates a fully customizable sitemap
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Version 3.15 | By Dagon Design | Visit plugin site
Dashboard Editor
Allows you to customise the dashboard.
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Version 1.1 | By Aaron Harun | Visit plugin site
Date Exclusion SEO
Gives your blog a feeling of freshness by turning off the display of date information after a specified number of days or immediately after posting. You also have the option of removing dates from Category and Tag Pages as well as the Front Page of your blog. You also have the option of providing alternative text for each type. You now have the option of turning off specific posts using comma delimited list of post ids. Additionally it allows you to turn on and off the date functions depending on your theme used.
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Version 1.5 | By Greg Royal | Visit plugin site
Digg Digg
Integrate “Digg”,”Reddit”,”dZone”,”Yahoo Buzz”,”TweetMeme(twitter)”, “fbshare(facebook)”, “Polladium”, “StumbleUpon” and “Delicious” Into WordPress Content
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Version 3.2.3 | By Yong Mook Kim | Visit plugin site
There is a new version of Digg Digg available. View version 3.2.4 Details or upgrade automatically.
Dynamic Headers by Nicasio Design
This plugin allows a custom header image to be displayed on each page
Activate | Edit | Delete
Version 3.4.7 | By Dan Cannon | Visit plugin site
GöSPress
GöSPress is a spellcheck plug-in for WordPress built around Googie Spell developed by Amir Salihefendic. GöSPress delivers spellcheck to those who prefer not to use the Visual Editor, along with the ability to allow spellcheck for reader commenting.
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Version 2.1a r004 | By Michael Gerard | Visit plugin site
Gigya Socialize – Increase Registration and Engagement using Facebook Connect, Twitter and OpenID
Integrates a variety of features of the Gigya Socialize service into a WordPress blog.
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Version 1.1.7 | By Nick Ohrn of Plugin-Developer.com | Visit plugin site
There is a new version of Gigya Socialize – Increase Registration and Engagement using Facebook Connect, Twitter and OpenID available. View version 1.1.8 Details or upgrade automatically.
Google AJAX Translation
Add Google AJAX Translation to your blog. This plugin allows your blog readers to translate your blog posts or comments into other languages. [Settings]
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Version 0.5.1 | By Libin Pan, Michael Klein, and Nick Marshall | Visit plugin site
Google Analyticator
Adds the necessary JavaScript code to enable Google’s Analytics. After enabling this plugin visit the settings page and enter your Google Analytics’ UID and enable logging.
Settings | Deactivate | Edit
Version 6.0.2 | By Ronald Heft | Visit plugin site | FAQ | Support | Donate
Google Analytics Visits by PepLamb
Google Analytics Visits by PepLamb! This plugin uses Google Analytics API to fetch data from your analytics account and displays user visits from each country in the widget. You will have to enter the account details in the options page Google Analytics Visits. Please donate to encourage us make more innovative plugins as this, thank you for your support!
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Version 1.1.3.5 | By PepLamb | Visit plugin site
Google Subscribed Links
Subscribers see your site’s results first and highlighted in Google.
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Version 0.1 | By Ankur Kothari | Visit plugin site
Google XML Sitemaps
This plugin will generate a special XML sitemap which will help search engines like Google, Yahoo, Bing and Ask.com to better index your blog.
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Version 3.2.2 | By Arne Brachhold | Visit plugin site | Settings | FAQ | Support | Donate
Keyword Optimizer
Keyword Optimizer plugin was developed so that important blog post keywords on a website could be optimized using the HTML strong, em, and u, tags.
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Version 1.0 | By Naif Amoodi | Visit plugin site
Keyword Research
Provides links for keyword research directly at the post and edit levels.
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Version 1.0 | By semvironment | Visit plugin site
Make Me Social
This plugin automatically sends your new posts to Delicious.com, Twitter.com, Tumblr.com and Diigo.com. Instantly gain new visitors each time you create a new post. If you already have another plugin posting your content to these services, deactivate it else your posts will be submitted twice to them.
Activate | Edit | Delete
Version 1.5 | By WeRedefine.com | Visit plugin site
MEMEdex Polls
Allows embedding polls created at MEMEdex into your posts.
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Version 1.3 | By Rick Strom | Visit plugin site
MyBlogLog
Adds MyBlogLog widgets and member pages to your blog.
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Version 0.92 | By Jason Tan | Visit plugin site
MyDashboard
This plugin provides a replacement ajax based Dashboard for WordPress.
Activate | Edit | Delete
Version 0.3.1a | By clearskys.net | Visit plugin site
Nofollow Blogroll SEO
A simple plugin that adds rel=”nofollow” attribute to non-homepage Blogroll Links. Improves SEO while still giving link love to your favorite sites.
Deactivate | Edit
Version 1.1 | By Scott Allen, aka WebGeek | Visit plugin site
OnlyWire for WordPress
Easily post to millions of sites with one button.
Settings | Deactivate | Edit
Version 1.6 | By OnlyWire Engineering | Visit plugin site
Pixel Sitemap
Adds a sidebar widget to easy customize and compact display links to all your posts.
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Version 1.0.0 | By Seobucks | Visit plugin site
Recent Google Searches Widget
Widget to display a list of recent search engine queries in a link to the wp search function.
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Version 1.20 | By Keith P. Graham | Visit plugin site
Robots Meta
This plugin allows you to add all the appropriate robots meta tags to your pages and feeds, disable unused archives and nofollow unnecessary links.
Settings | Deactivate | Edit
Version 3.2.5 | By Joost de Valk | Visit plugin site
Search engine keywords highlighter
highlight the keywords if the visitor is from search engine
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Version 0.1.1 | By emptyhua@gmail.com | Visit plugin site
SI CAPTCHA Anti-Spam
Adds CAPTCHA anti-spam methods to WordPress on the comment form, registration form, login, or all. This prevents spam from automated bots. Also is WPMU and BuddyPress compatible. Settings | Donate
Settings | Deactivate | Edit
Version 2.2.7 | By Mike Challis | Visit plugin site
Simple Trackback Validation
Eliminates spam trackbacks by (1) checking if the IP address of the trackback sender is equal to the IP address of the webserver the trackback URL is referring to and (2) by retrieving the web page located at the URL used in the trackback and checking if the page contains a link to your blog.
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Version 2.1 | By Michael Woehrer | Visit plugin site
Sociable
Automatically add links on your posts, pages and RSS feed to your favorite social bookmarking sites.
Settings | Deactivate | Edit
Version 3.5.2 | By Blogplay | Visit plugin site
Spelling Checker
Allows checking of spelling for posts, using the Speller Pages open source project at http://sourceforge.net/projects/spellerpages/. Configure on the Spell Checker Configuration page.
Activate | Edit | Delete
Version 1.18 | By Brian “ColdForged” Dupuis | Visit plugin site
Subscribe2
Notifies an email list when new entries are posted.
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Version 5.2 | By Matthew Robinson | Visit plugin site | Settings | Donate | Forum
Subscribe2 Counter Widget
Adds a sidebar widget to easily customize and display your Subscribe2 subscribers stats.
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Version 5.2 | By Matthew Robinson | Visit plugin site
TanTanNoodles Simple Spam Filter
A plugin that does a simple sanity check to stop really obvious comment spam before it is processed.
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Version 0.6.2 | By Joe Tan | Visit plugin site
TrustMeter widget
See if google loves your blog or not
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Version 0.3 | By Alex Fedorov | Visit plugin site
TweetMeme Retweet Button
Adds a button which easily lets you retweet your blog posts.
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Version 1.7.4 | By TweetMeme | Visit plugin site
There is a new version of TweetMeme Retweet Button available. View version 1.7.5 Details or upgrade automatically.
Tweet Tweet
Archive your Twitter conversations
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Version 0.5.4 | By Donncha O Caoimh | Visit plugin site
Twitter Keywords
Place on your blog what Twitter is saying about certain keyword.
Activate | Edit | Delete
Version 1.0 | By Jose Llinares | Visit plugin site
Twitter Tools: bit.ly Links
Makes the links that Twitter Tools posts to Twitter be API-created bit.ly links so you can track the number of clicks and such via your bit.ly account. Requires PHP 5.2.0+.
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Version 1.1.2 | By Viper007Bond | Visit plugin site
Ultimate Google Analytics
Enable Google Analytics on your blog. Has options to also track external links, mailto links and links to downloads on your own site. Check http://www.oratransplant.nl/uga/#versions for version updates
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Version 1.6.0 | By Wilfred van der Deijl | Visit plugin site
User Access Manager
Manage the access to your posts and pages. Note: If you activate the plugin your upload dir will protect by a ‘.htaccess’ with a random password and all old media files insert in a previous post/page will not work anymore. You have to update your posts/pages. If you use already a ‘.htaccess’ file to protect your files the plugin will overwrite the ‘.htaccess’. You can disabel the file locking and set up an other password for the ‘.htaccess’ file at the UAM setting page.
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Version 0.9.1.3 | By Alexander Schneider | Visit plugin site
Vertical scroll recent registered user
This plug-in will vertically scroll the recent registered user with avatar & date in sidebar..
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Version 1.0 | By Gopi.R | Visit plugin site
Whydowork Adsense
Insert Adsense code in your pages without modifying the template. Show different ads for articles older than 7 days (or as old as you wish).
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Version 1.2 | By Whydowork | Visit plugin site
WordPress.com Stats
Tracks views, post/page views, referrers, and clicks. Requires a WordPress.com API key.
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Version 1.6 | By Andy Skelton | Visit plugin site
There is a new version of WordPress.com Stats available. View version 1.6.1 Details or upgrade automatically.
WordPress From/Where
Logs requests from search engines and determines what keywords are being used to find your posts!
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Version 1.0 | By Elliott Back | Visit plugin site
WordPress Mobile Edition
Show your mobile visitors a site presentation designed just for them. Rich experience for iPhone, Android, etc. and clean simple formatting for less capable mobile browsers. Cache-friendly with a Carrington-based theme, and progressive enhancement for advanced mobile browsers.
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Version 3.1 | By Crowd Favorite | Visit plugin site
World Clock
Adds a multi-timezone clock widget to the sidebar.
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Version 0.6.1 | By Xander Tan | Visit plugin site
WP-Activity
Display activity stream on your community site
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Version 0.6 | By Dric | Visit plugin site
WP Email Capture
Captures email addresses for insertion into software such as Aweber or Mailchimp
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Version 1.7.3 | By Rhys Wynne | Visit plugin site
There is a new version of WP Email Capture available. View version 1.8.1 Details or upgrade automatically.
WP Hide Post
Enables a user to control the visibility of items on the blog by making posts and pages selectively hidden in different views throughout the blog, such as on the front page, category pages, search results, etc… The hidden item remains otherwise accessible directly using permalinks, and also visible to search engines as part of the sitemap (at least). This plugin enables new SEO possibilities for authors since it enables them to create new posts and pages without being forced to display them on their front and in feeds.
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Version 1.1.9 | By Robert Mahfoud | Visit plugin site
WP Robot
Automatically post content related to any topic of your choice to your weblog.
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Version 1.31 | By Lunatic Studios | Visit plugin site
WP Super Cache
Very fast caching plugin for WordPress.
Settings | Deactivate | Edit
Version 0.9.8 | By Donncha O Caoimh | Visit plugin site
WP TimeSheets
A simple timesheet software for WordPress
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Version 0.3 | By Akshay Raje | Visit plugin site
WP to Twitter
Updates Twitter when you create a new blog post or add to your blogroll using Cli.gs. With a Cli.gs API key, creates a clig in your Cli.gs account with the name of your post as the title.
Deactivate | Edit | Settings
Version 1.5.7 | By Joseph Dolson | Visit plugin site
YouTube SimpleGallery