FeedBurner SiteStats Enabler allows you to add the code to the theme that allows Feedburner to track your site stats as well.
Yet Another Photoblog converts your WordPress 2.x installation into a full featured photoblog in virtually no time.
GenKeep is a plugin which allows WordPress to keep track of your birthday. You can display your current age, your birthday, and lots of other age related things.
Wiki Syntax allows you to use simple wiki syntax for posts.