R2-S2 (R2 Steam Too) - The steam powered R2-D2
Check out this amazing working R2-D2 unit run by steam! Now THAT'S steampunk in action!
http://www.makezine.com/blog/archive/2007/04/r2s2_r2_steam_too_the_ste.html
(with video!)
More info and specs here:
http://www.crabfu.com/steamtoys/r2s2/
(Originally snagged from make_podcast)