I was looking at Digi01's Turbot and thinking how cool it was to have a robot that could move and react to stimuli without any software. Some poking around showed me that the original Turbot was a creation of Mark Tilden, the inventor or BEAM robotics.
BEAM stands for Biology, Electronics, Aesthetics, Mechanics. It is a style of robot making that takes it's inspiration from biology. Most BEAM robots are controlled with simple analog circuitry rather than a microcontroller.