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"IGN's gotten a preview of the Gametrak Freedom motion-controller we first spied back in September. Designed by Performance Designed Products (PDP), the Xbox 360 (which will probably also be available for the PS3 at some point, too) stick's looks have changed quite a bit since then. Like most other motion controllers it uses accelerometers, but also adds ultrasonic 3D positioning using two sensor bars mounted to the display, which can triangulate the device's positioning to precisely calculate its distance, orientation and speed. Though the Gametrak Freedom is expected for Xbox 360 in the fourth quarter of this year, there are no specific details about pricing or availability yet. [Via Joystiq]"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2009/03/25/gametrak-freedom-motion-controller-for-xbox-360-outed-at-gdc/>