Well my grandson keeps kicking my butt in Halo. Combined with those Xbox 360 controllers are not well designed for us with only one hand. So I was hoping that someone had come up with an app that uses the Droids sensors and touch screen to act as a controller.
Well after some research it doesn't look like theres anything currently available, although it seems as if it can be done because there are multiple apps that allow your phone to act as a wii controller (Wiimote controller, simplewiicontroller, etc.)
I guess all you can do is wait and see what pops up in the market!