Awsom Drop-down Archive displays a drop down archive of your posts above your posts on your index and individual posts page.
Notify Unconfirmed Subscribers fetches all the subscribers who have not yet confirmed their FeedBurner email subscriptions to your feed.
WordPress Petition helps you run a simple web based petition through your WordPress based site or blog.
PlainTags lets you use a list of plain text tags.
Simple Tags provides an easy way to manage your WordPress 2.3 tags.