Note (9/12): there is an application in the iBrickr PXL repository called 'Balls' which links to this page. I have nothing to do with that app; it was created by Grudgnor over at the MacRumors forum.
Those who have followed this blog will know that I like to like to play with unusual input methods (see my earlier posts on , ambient light sensors, and the SmackBook).
As it turns out, the iPhone has a built-in LIS302DL, a tiny 3-axis accelerometer. While some have attempted to use it from....