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. By Matt Mullenweg.

Out-of-the-box SEO for your WordPress blog. Donate | Support By Michael Torbert.

Allows for widget-based collapsible categories, based on the “List Expander” written by Alan Grakalic at cssglobe.com. By Leo Jackson.

Show different number of posts in home, category, search or archive page. By MaxBlogPress.

The Do Follow plugin removes the nofollow attribute that WordPress adds in comments. By Denis de Bernardy.

Add or edit excerpts for Posts and Pages. By Andrew Ozz.

Provides a checkbox on the editing page which you can check to exclude pages from the primary navigation. IMPORTANT NOTE: This will remove the pages from any “consumer” side page listings, which may not be limited to your page navigation listings. By Simon Wheatley.

Originally authored by Steve Smith, this plugin detects all ways to access your original WordPress feeds and redirects them to your FeedBurner feed so you can track every possible subscriber. By FeedBurner.

This plugin will repair any tables that need repaired, then it will optimize the tables. By Donnie La Curan.

Adds the necessary JavaScript code to enable Google’s Analytics. By Ronald Heft, Jr..

This plugin will generate a sitemaps.org compatible sitemap of your WordPress blog which is supported by Ask.com, Google, MSN Search and YAHOO. By Arne Brachhold.

This is not just a plugin, it symbolizes the hope and enthusiasm of an entire generation summed up in two words sung most famously by Louis Armstrong: Hello, Dolly. When activated you will randomly see a lyric from Hello, Dolly in the upper right of your admin screen on every page. By Matt Mullenweg.

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. By Rob Marsh, SJ.

Displays a highly configurable list of related posts. Similarity can be based on any combination of word usage in the content, title, or tags. Don’t be disturbed if it takes a few moments to complete the installation — the plugin is indexing your posts. Instructions and help online. Requires the latest version of the Post-Plugin Library to be installed. By Rob Marsh, SJ.

Show the tweets about your posts and pages as comments on your blog! By Joost de Valk.

Removes WordPress fancy quotes, which is very useful if you post code snippets to your site. By Denis de Bernardy.

On-demand backup of your WordPress database. By Austin Matzko.

Display your WordPress blog statistics. Ranging from general total statistics, some of my plugins statistics and top 10 statistics. By Lester 'GaMerZ' Chan.

Adds a Stats Widget to display stats from WP-Stats Plugin. You will need to activate WP-Stats first. By Lester 'GaMerZ' Chan.