Allows you to easily upgrade to Beta releases.
Gives you a number of javascript hotkeys on the frontend of your blog like P2 does
WP Contact Form is a drop in form for users to contact you. It can be implemented on a page or a post.
Allows users to configure a reminder for if they haven't blogged in a while.
Used to monitor for wordpress version updates and displays info in the admin screen.
Allows you to use query_posts to list the children of a page.
Allows you to edit excerpts for Pages.
Allows you to extend the list of mime-types supported by the builtin uploader.