This is a collection of 11 great WordPress plugins, all of which are used frequently on this blog. All of these plugins work on WordPress version 3.1 and higher.
Used by millions, Akismet is quite possibly the best way in the world to protect your blog from comment and trackback spam. It keeps your site protected from spam even while you sleep.
All in One SEO Pack
Out-of-the-box SEO for your WordPress blog.
Send email after replying a comment on the blog comment system.
Delete Spam Daily
Uses wp_cron to delete comments each day that are marked “spam” in the database.
Google Syntax Highlighter for WordPress
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.
VaultPress is a subscription-based protection, security and backup service for WordPress blogs and sites. I highly recommend this one!
W3 Total Cache
The fastest and most complete WordPress performance plugin. Dramatically improve the speed and user experience of your site. Add browser, page, object and database caching as well as minify and content delivery network (CDN) to WordPress.
Tracks views, post/page views, referrers, and clicks. Requires a WordPress.com API key.
Adds a more advanced paging navigation to your WordPress blog
WP to Twitter
Posts a Twitter status update when you update your WordPress blog or post to your blogroll, using your chosen URL shortening service. Rich in features for customizing and promoting your Tweets.