Fishbowl for Facebook is a WPF application created by Microsoft that takes advantage of some of the new Windows 7 features like jumplists and multitouch. Working like a WPF version of the Facebook site, you can do most of the same things you would do through a browser like status and comments, browse friend photos or upload your own, but with added functionality like dragging and dropping in new photos.
Download it for yourself at http://www.fishbowlclient.com/.
