OK, well, sort of off topic, and not really robots, but perhaps it could be used for robotics, or something? Anyway, for your amusement and mine... I saw this article on TheForce.net and was amused that it mentions that the U.S. government has developed repulsor technology like that used in the Star Wars speeder. The work is based on a Russian scientist named Dr Evgeny Podkletnov who created a 4 inch superconducting spinning disk which is said to shield gravity and make anything above it be 2% lighter. Perhaps this technology could be used for making things float (repulsor technology), or as a weapon to shoot gravity (or anti-gravity) at someone (ouch)! Although, this is controversial and improbable, it seems that Janes reports that this Anti-gravity propulsion comes `out of the closet' and that Nasa, and Boeing, and Lockeed and others are all experimenting with it. Of course this is all 'black world' stuff so it's all hush hush, but who knows, we may just see all those flying saucers that have been hovering over Area 51 soon! Do a google search on 'Podkletnov' for more info on anti-gravity devices! I doubt it's true, but if it is, this would definitely revolutionize, aviation, robotics, etc.!