Xbox modders Team X-tender have introduced a new kit that will let you easily add tilt control (ala Sony’s SIXAXIS) to your Xbox 360’s wireless controller.
The XCM BestTilt includes a complete replacement shell for the back of the 360’s controller. It requires just a small amount of soldering to install (five easy solder points.) Once you hook those up, it just screws into place, and you’re ready to go.
Here’s a video of the controller in action: