A simple to use WordPress plugin based on Flickr API which digests all your photos posted in last X days in a single post periodically.
This plugin simply adds your post thumbnails to your RSS feed as enclosures. Nothing else to it.
Simple Twitter Connect makes it easy to integrate your site with Twitter, in a wholly modular way.
This is a simple plugin to create a tabbed menu in a post using Rico Ajax.
Google Buzz. Beautiful Google buzz integration to wordpress + admin panel options (Settings -> WP Google-buzz) + 14 diff button images + mouse over effects.
NextGEN Gallery is a full integrated Image Gallery plugin for WordPress with a Flash slideshow option.
Simple:Press is a feature rich forum plugin for WordPress. It fully integrates into your WP based site utilising the same user records and database and displaying on a single WP page.