To pull up an interesting topic from long ago, the Palm Pilot Robot is really cool not because it can do anything interesting or even because it’s a particularly practical robot. It’s interesting due to it’s unique method of locomotion. It is a three wheeled robot with can move in arbitray directions even though it has no steering mechinisms. It does this with the help of a set of wheels with rollers capible of rotating perpendicular to their main axis of rotation. Ok it’s really hard to explain, but pretty simple to under stand if you take a look at the robot and the wheels.