The PowerBook Sudden Motion Sensor "This example creates a window displaying a bicycle wheel. The window i "stable" in the sense that if you rotate the PowerBook left or right, th window compensates by rotating itself by an equal amount in the opposit direction in an attempt to remain in its original orientation with respect to th ground. The bicycle wheel rotates too — independently of the window."
"While the PowerBook only uses the AMS as a defensive measure to prevent accidental damage to the disk drive, suc sensors could have a variety of uses. In particular, they have been considered as alternative input methods in use interfaces for video game controllers, phones, PDAs, and other mobile devices. While it is to be seen if they will b successful in these areas, such use at least has a novelty value"