Mjolnir robot. Leland writes -

Hope you like this one. It’s a robot controlled by Arduino, Adafruit ethernet shield and an Android client. (There’s source for an XBee/Adafruit motor contoller version, too, but no pictures or video of that.) Link has everything you could want – schematic, documentation, source code links, video and a picture of a bunch of geeks. Oh… okay… everything you could want and more, then.