AVR Butterfly walking robot
Figurassa have built simple humanoid robot called Little Brother. The idea was to build cheap humanoid robot which walks. So he managed to do this for less than $70.
He have chosen interesting way to make robo walk. He managed to carry robot mass center from one leg to another. This allows to move free leg forward. Simple but it works. Robot central brain is AVR Butterfly kit with three servos attached. Robot body is a product of imagination :). Author used old CD-R and some aluminium. Robot code is developed under Linux AVR-GCC and can be found here.