If you are a fan of Star Wars then you are going to love this. It seems Vimal Patel, creator of this cool little robot, has a fondness for motorised Lego robots, of which is evident from his Flickr and YouTube pages.
The motorised droid can roll around, rotate its head, manoeuvre its robotic arm, and lower/raise its third leg.
The Lego Digital Designer LXF file is available so you can make your own. In the meantime take a look at his Lego Droid in action.