I wanted to make a walking robot but I only had three servos to do it with. After using one for each leg I need the third one to shift the weight from one leg to another to allow the return stroke. This is what I came up with.

It's amusingly assembled with baling wire, rubber bands and bent cardboard. It uses the SSC-32 serial servo controller my darling wife bought me for xmas, driven by an Arduino Uno. This was really an excuse to learn about the SSC-32.