At the TechEd Middle East Microsoft showed off a game developed in Visual Studio. The interesting thing about this is that it plays on Windows with a keyboard, on the 360 with a controller and on your Windows phone 7 series using the accelerometer.
The real awesome thing about it is that you can start the game on your phone, then keep playing (from the same spot) on your PC at work (in your lunch break of course) and then finish it on your 360 at home.
check out the demo here
