Thanks to Star Wars, Plenty of people have built their own R2 units. Pixar's next movie has been running trailers for a while, and there's already a group(free membership required) devoted to building real versions of the SGI robot star: WALL-E. I guess I'll have to call it reverse-forward engineering. WALL-E has some interesting design ideas - it compacts trash into cubes, but it can also retract its treads into the same compacting area. (Pictured is a WALL-E style waste cube, by [Jawa Lunk]) Thanks to [Shannon] deserves the credit for turning me onto this one.
http://www.hackaday.com/2007/11/21/real-robots-from-movie-designs/