I just have to inform you about this gem I found a couple of days ago called Gymnast. Never have I thought a gymnast simulation could be this fun.

Gymnast is a physics-based acrobatic game with 100% analog controls. The game makes use of a modern gamepad, using the analog thumbsticks to give 1-to-1 control over the joints on a gymnast character.

You'll need a wireless receiver for your Xbox360 controller to properly play the game but since the game is freeware, those 20$ seem like a bargain. Plus, you'll be able to play all other PC/Flash games using Joy2Key unless the game normally supports the Xbox360 controller which almost all new games do. But then again, the game is coming to XBLA so you'll be able to play it on your Xbox whenever that comes out.
Or then again, you can just use any joypad with two analog sticks.

There's also a community website with user created levels and replays but for some reason it's not as populated as I want it to be. The game is still fresh so I guess it needs time.

For your own sake, check out the game at once. :)