Mondo Spider by the Mondo Spider Project
This is a giant mecanical spider, each of the 8 legs is independtly controled by a hydraulic system powered by a diesel engine. The driver controls are simple: two levers, just like a tank or a bulldozer. It can run forward and backward, and turn in any direction (a bit like a tank, it can turn on its central axis without moving). I was a bit disapointed that it cannot walk sideways :)
You can see a video I made of the Mondo Spider in action here: www.youtube.com/watch?v=sLOVdo_Qu3E
Photo taken at the Burning Man 2006 festival (Black Rock Desert, Nevada).