Matt Webb: apples powerbook (4 March 2005, Interconnected).
Apple’s PowerBook laptops now have a little accelerometer inside that’s used to protect the hard drive if you drop it (it notices the sudden speed increase and parks the drive heads). This guy has found a way to tap into the sudden motion sensor, and Timo was just round my house with his brand new PowerBook, so we spent a few minutes of looking at the stuff on that site (a window that rotates so it’s always the right way up). Then we saw there was a little tool that gives you the angle of the machine in three dimensions. Aha. (I love accelerometers.)