Control Google Maps by Tilting your ThinkPad
Historical article · Originally published June 18, 2006; technical details may be outdated.
"Another day, another hack. Here's a demo that controls Google Maps using ThinkPad Hard Drive Active Protection sensor. You tilt your ThinkPad and Google Maps roll over. Pretty cool."
Oh, this is very very cool! Especially if you have a ThinkPad Tablet PC, like my friend Ariel does, who incidentally, recommended this link to me.
You can download the code that does this from their SVN Repository, which is a good way to see how this hack was created..