Akismet
Akismet checks your comments against the Akismet web serivce to see if they look like spam or not. You need a WordPress.com API key to use this service. You can review the spam it catches under “Manage” and it automatically deletes old spam after 15 days. Hat tip: Michael Hampton and Chris J. Davis for help with the plugin. By Matt Mullenweg.

Extended Live Archives
Implements a dynamic archive, inspired by Binary Bonsai and the original Super Archives by Jonas Rabbe. Visit the ELA option panel to initialize the plugin. By Arnaud Froment.

Category Visibility-RH Rev
Alter the visibility settings for categories, for WordPress 2.0. Based on an earlier Category Visibility by Keith McDuffee. By Rich Hamilton.

flickrRSS
Allows you to integrate the photos from a flickr rss feed into your site. By Dave Kellam.

Get Recent Comments
Display the most recent comments or trackbacks with your own formatting in the sidebar. Visit Options/Recent Comments after activation of the plugin. By Krischan Jodies.

Google Analyticator
Adds the necessary JavaScript code to enable Google’s Analytics. After enabling this plugin visit the options page and enter your Google Analytics’ UID and enable logging.

Gravatar
This plugin allows you to generate a gravatar URL complete with rating, size, default, and border options. See the documentation for syntax and usage. By Tom Werner.

Yahoo/MSN Style Smileys
Displays Yahoo Messenger or MSN Messenger style smileys. Please deactivate ‘Convert emoticons like and to graphics on display’ under Writing Options menu when using this. By Priyadi Iman Nurcahyo.

Kill Preview
Replaces the post preview iframe from the post writing screen with a popup link. By Owen Winkler.

Noteworthy
Mark posts as ‘noteworthy’. By Jamie Saunders.

Photopress
Photopress adds user-friendly image handling tools to WordPress, including a popup upload and browse tool, a random image template function, and a simple album. Installs and uses database tables. By Isaac Wedin.

Quoter
Allows commenters to quote other comments (dynamically or server side if they have Javascript disabled) and any other text in a page (Javascript only). By Daniele Mancino.

Related Posts
Returns a list of the related entries based on active/passive keyword matches. By Alexander Malov & Mike Lu.

SparkStats
Generates a Sparkline bar graph of your site posts and comments statistics. By Sean McBride.

Scrobbler
Displays AudioScrobbler / Last.fm webservice information (e.g. recently played tracks), on your blog using AJAXrefreshing(tm) By Florian Kriener.

SpotMilk Js Style.
SpotMilk is the admin theme for WordPress 2.0, which is inspired by Spotlight on Mac OS X Tiger and the Milk theme by Max Rudberg, and the main layout is based on the default admin theme in WP 2.0. By Sunghwa Park.