My Quest for WordPress Plugins

As part of Automattic’s acquisition of Intense Debate, I committed to convert all of my blogs over to WordPress.  The process has begun and should be done soon.  In the mean time, I’m on a quest for all the great WordPress plugins.  I’ve already got the Lijit Search, FeedBurner, and MyBloglog plugins queued up.  If you’ve got other recommendations, please leave them in the comments.