Since the portables of Apple had this motion-sensor gyroscopic whatever-thingy to protect your harddrive while your Laptop tries to fall down, nobody was aware of one really fine thing: Why not use this ability to protect your MacBook Pro/PowerBook from stealing?
Try iAlertU… it’s fun and useful! :-)
Now, this is completely useless, but another fun application that uses the motion-sensor is MacSaber, which turns your MacBook into a lightsaber (Well, sort of..) Take a look at MacSaber in action here:
http://youtube.com/watch?v=qK4AonfnFaM
Strong the force with this notebook is, young padawan :)
BTW: More to see here: http://www.macsaber.com/ :-)