Supercharge WordPress with tools that help you to blog better and faster — all by activating a single plugin. Jetpack is a suite of great add-ons that are fully supported by the team behind WordPress.com.
you can get better feedback on your site’s popularity with WordPress.com Stats
never publish a typo again with After The Deadline
readers will love the social features from Sharedaddy (including sharing posts on Twitter, Facebook, StumbleUpon and many others)
Twitter Widget lets people know your latest 140-character thoughts
and there’s lots more!
Find out more, and download Jetpack, at Jetpack.me