Sorry @Bass for having brought Silverlight into this thread, I just thought i'd mention it since I saw a human body demo (a lame mockup) done in Silverlight. IF it was similar to Google's it would have been nice, but read my views below.
Also, let me change my statement on SL a bit: "I have nothing against Silverlight and its fans, BUT i hate it when they hide the fact that it's not a standard, not open and it's patent encumbered, oh and i hate it when they try to make it look like its x-platform. IT IS NOT WEB(tm)."
WebGL >> Silverlight (yes, yes, i know they're different, i'm talking openess)