Remember the final moments of the Scott Guthrie keynote presentation at PDC09? Where Brian Goldfarb came on stage and demonstrated a completed application using a lot of the features of Silverlight 4? Yeah, that Facebook application. Well, it’s here now!
You can install it from here. But wait … I have a bad news for you, they are not providing the source and code and worst of all they obfuscated the application so you can’t even use Reflector to look inside! :<