Xbox controller on OSX?

During the steam sale I picked up a few games that would play on either OSX or in Windows. A few of these (like Driver) I'd rather play with an Xbox controller but I play on a Mac laptop and my Windows partition there is pretty small so if possible I'd like to play on the OSX side.

Any suggestions for getting an XBox controller to work with OSX?

I found tattiebogle but couldn't map the keys for the game.