The Snowbot by Think Geek is a USB robot powered by your computer.  When you plug in the Snowbot using its own USB cord, it has a blue or red light, you choose, scrolling across it's visor where it, if it was a real robot, would see things.  The Snowbot also has a creepy thrumming sound you can turn on and off, as well as having arms that can move and grip things, with your help of course!