NJ5 said:
But to use it for pointing, every slight error would accumulate since there's no frame of reference to reset to. After a few minutes (or even earlier), the pointer would be so off that you would have to point at the floor or at the ceiling. Accelerometers are good enough for relative movement, but not for absolute positioning. For that you need a fixed frame of reference such as the sensor bar on the Wii, or a God-like accelerometer which doesn't exist.
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Submarines use highly sensitive gyroscopes for inertial navigation under water. Of course, I doubt they fit something as sensitive as that in the SIXAXIS.