It would be really nice to have a usb to usb and xbox controller and ps2 controller or sony controller. I know its possible to make the PC see a device as a keyboard or mouse but would like to make it possible to use any controller as wasd or up arrow down arrow left arrow right arrow. and the ability to assign a few numbered keys.
look at this project!
with the same technique you could translate the input of any controller into a signal for the original controller.
it does not have to bea xbox360 it could be any input to any controller