At PDC, a Silverlight 4 application called “SilverFace,” which's developed using Facebook SDK was demonstated, that lets you do update your status, upload photos, view friend’s photos and videos, and much more on Facebook directly from Windows desktop. You can think of this as more of a “technology showcase” and a demo of what technology can do. Microsoft released a Windows 7 app called “Fishbowl for Facebook,” 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: Fishbowl for Facebook