The Razer Hydra 3D controller is now available (in North America at least)
I think it has much potential as a musical controller because it's made for short distance and it is said to be very precise (1 millimeter / 1 degree). It uses a magnetic sensing system (capacitive ?). It could be a nice alternative to Kinect and Wiimote.
However it's currently PC-only. Has anyone tried it yet ?