the sudden motion sensor solution is imperfect, and, more to the point, the version of it that was explained to me works by locking the drive heads which means that hard drive access would be impossible while the sudden motion is in progress, which, if you're wearing the damn thing while you're walking around GPSing, could be prettymuch all the time. there are shock absorption technologies that would address this, but i suspect they aren't implemented at the level you'd want in your current laptop, so at the very least you'd want a line of computers designed with this issue in mind.