Subscribe-Remind will automatically place text at the end of each of your posts inviting your readers to subscribe to your RSS feed.
Comments Waiting Count is a simple plugin that adds the current number of comments in the moderation queue to the WordPress 2.1 admin menu. It will also display the number comments that have been flagged as spam if your using an anti-spam plugin.
Folding@Home Stats is a WordPress plugin that displays your total score, overall rank, number of processes completed in the last 50 days.
Fuzzy Colorpicker adds a color picker to your post pages. This lets you choose the color of your text at will.
wp-page-linker is a WordPress plugin that allows the insertion of links to internal pages while writing a page or a post.
EasyTube allows you to easily embed a youtube player into your website but one simple tag.