Extend your registration form with the user profile fields
The table of contents plugin generates a table of contents from a post or page.
Take long winding URL's and make them short and snappy. Also keeps track of clicks. There's a new version on the way with some improved feat
Turn your blog comments into a conversation swiss army knife.
This plugin will load your most recent workouts from MapMyRide/MapMyRun/MapMyHike/MapMyFitness and display them on your wordpress blog.
This plugin allows you to add RSVP and guestlist functionality. Guests can leave custom messages for the planners. Uses Google Docs spreadsheets.
Yet Another Random Quote, a WordPress plugin which randomly displays quotes.
Allows the user to display statistics for their blog's/forum's Disqus comments.
SuperLinks is a sidebar widget that gives you greater control of displaying your links and blogroll.
This plugin shows the path to the page or post the user is currently surfing.
This plugin colorize table row in alternating colors automatically to improve readability.
in connection with Akismet, write in a .htaccess file
Twitterfountain mashes up tweets and Flickr-images that share the same tags into a spectacular visual.