For those of you with 3D printers there was an interesting snippet at the end of tonight QI program on ABC TV. Apparently you can download a model of a wind powered device that walks like crab. It was interesting to see it work. Apparently the design builds full size versions on the beaches of I think Steven Fry said Holland.
EDit: yep found it Theo Jansen
http://www.shapeways.com/shops/theojansen
another link
http://www.strandbeest.com/