Dr. Popper Xbox 360 XNA game running in Silverlight 2 with (almost) no code changes using the free SilverSprite library
Key mappings: Space Bar=A, B=B, X=X, Y=Y Enter=Start, Cursor Keys=DPad

If you like the game, you can get a free trial for your Xbox 360 or buy for 200 points here: http://marketplace.xbox.com/en-US/games/media/66acd000-77fe-1000-9115-d80258550147/