Here is a list of a few good WordPress plugins.
Some WordPress plugins duplicate each other so be selective, understand what the plugin does BEFORE activating and only activate those you really use. Backup your database before activating.
All in One SEO Pack
Out-of-the-box SEO for your WordPress blog.
Broken Link Checker
Checks your blog for broken links and missing images and notifies you on the dashboard if any are found.
cbnet Ping Optimizer
Saves your wordpress blog from getting tagged as ping spammer. (Note: this plugin is a fork of the MaxBlogPress Ping Optimizer plugin, with registration/activiation functionality removed.)
Configurable Tag Cloud
A tag cloud plugin for WordPress to give you more flexibility with the styling of your tag cloud.
Contact Form 7
Just another contact form plugin. Simple but flexible.
Dean’s FCKEditor For WordPress
Replaces the default WordPress editor with CKeditor
Dean’s Permalinks Migration
With this plugin, you can safely change your permalink structure without breaking the old links to your website,and even doesn’t hurt your google pagerank.
Deep Link Engine
Each time you create a new post it shows a list of possible pingback enabled blogs with relevant contents to your blog entry. You can then choose ones you will ping back and it will do this automatically. It also collects statistics about pinged blogs and relevant information so future blog posts will show even more relevant blogs to ping back to.
Easy Contact
Easy Contact is a simple, semantic contact form that utilizes the Sandbox design patterns. Insert using [easy-contact]. A plaintxt.org experiment for WordPress.
Easy Privacy Policy
Automatically adds a privacy policy page that includes an Adsense compliancy section. Configure it at Settings ? Easy Privacy.
FLV Embed
Standards compliant FLV embedding in your blog posts using SWFObject by Geoff and FLV Player by Jeroen. Supports Video Sitemap generation.
Free Traffic Getting SEO PluginTM 2.0
Free Traffic Getting SEO PluginTM 2.0 finds the best SEO plugins available for wordpress and then optimizes their settings so you don’t have to. Saves you time and helps get you more traffic.
GD Press Tools
GD Press Tools is a collection of various administration, seo, maintenance and security related tools that can help with everyday blog tasks and blog optimizations.
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.
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.
HeadSpace2
Meta-data manager on steroids, allowing complete control over all SEO needs such as keywords/tags, titles, description, stylesheets, and many many other goodies.
Page Links To
Allows you to point WordPress pages or posts to a URL of your choosing. Good for setting up navigational links to non-WP sections of your site or to off-site resources.
PC Robots.txt
Automatically creates a virtual robots.txt file for your blog.
Platinum SEO Pack
Complete SEO solution for your WordPress blog.
Plugin Central
Automatically installs WordPress plugins by name and URL. Provides automatic update of multiple plugins.
Post-Plugin Library
Does nothing by itself but supplies common code for the Similar Posts, Recent Posts, Random Posts, and Recent Comments plugins. Make sure you have the latest version of this plugin.
Really Simple CAPTCHA
Really Simple CAPTCHA is a CAPTCHA module intended to be called from other plugins. It is originally created for my Contact Form 7 plugin.
Redirection
Manage all your 301 redirects and monitor 404 errors
SEO Friendly Images
Automatically adds alt and title attributes to all your images. Improves traffic from search results and makes them W3C/xHTML valid as well.
SEO Smart Links
SEO Smart Links provides automatic SEO benefits for your site in addition to custom keyword lists, nofollow and much more. (Brian Edition)
SEO Super Comments
Use your blog comments to get more traffic.
SEO Title Tag
Search engine optimize your blog’s title tags. Create a customized title tag for any post, static page, category page, UltimateTagWarrior tag page – indeed, any URL! And will auto-insert the tag name into the title on tag pages generated by UltimateTagWarrior plugin. Admin allows for mass editing of title tags.
Simple Tags
Extended Tagging for WordPress 2.8 and 2.9 ! Suggested Tags, Mass edit tags, Autocompletion, Tag Cloud Widgets, Related Posts, Related Tags, etc!
Smart 404
Rescue your viewers from site errors! When content cannot be found, Smart 404 will use the current URL to attempt to find matching content, and redirect to it automatically. Smart 404 also supplies template tags which provide a list of suggestions, for use on a 404.php template page if matching content can’t be immediately discovered.
StatPress Reloaded
Improved real time stats for your blog
tagaroo
Find and suggest tags and photos (from Flickr) for your content. Integrates with the Calais service.
TweetMeme
Retweet Button Adds a button which easily lets you retweet your blog posts.
Twitter Tools
A complete integration between your WordPress blog and Twitter. Bring your tweets into your blog and pass your blog posts to Twitter. Show your tweets in your sidebar, and post tweets from your WordPress admin.
Twitter Tools
Bit.ly URLs Use Bit.ly for URL shortening with Twitter Tools. This plugin relies on Twitter Tools, configure it on the Twitter Tools settings page.
Twitter Tools – Exclude Category
Exclude posts in certain categories from being tweeted by Twitter Tools. This plugin relies on Twitter Tools, configure it on the Twitter Tools settings page.
Twitter Tools – Hashtags
Set #hashtags for blog post tweets sent by Twitter Tools. This plugin relies on Twitter Tools, configure it on the Twitter Tools settings page.
WassUp
Wordpress plugin to analyze your visitors traffic with real time stats, chart and a lot of chronological informations. It has sidebar Widget support to show current online visitors and other statistics. For WordPress 2.2 or higher.
WordPress Database Backup
On-demand backup of your WordPress database. Navigate to Tools ? Backup to get started.
WordPress Firewall
Blocks suspicious-looking requests to WordPress.
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.
WordPress Table Rename
Renames WordPress tables to mitigate some SQL injection attacks.
W3 Total Cache
W3 Total Cache improves the user experience of your blog by improving your server performance
WP-Ads
AdServer for WP
WP-DBManager
Manages your WordPress database. Allows you to optimize database, repair database, backup database, restore database, delete backup database , drop/empty tables and run selected queries. Supports automatic scheduling of backing up and optimizing of database.
WP-SpamFree
An extremely powerful anti-spam plugin that virtually eliminates comment spam. Finally, you can enjoy a spam-free WordPress blog! Includes spam-free contact form feature as well.
WP Auto Tagger
Automatically finds tags based on your post content.
WP Security Scan
Perform security scan of WordPress installation.
WP Super Cache
Very fast caching plugin for WordPress.
WPtouch iPhone Theme
A plugin which formats your site with a mobile theme for the Apple iPhone / iPod touch, Google Android, Palm Pre and other touch-based smartphones.
WordPress plugins make adding features to your blog a real breeze.
