I searched for a thread on this and couldn't find one. I'm sure this has been shown around. However, if you haven't seen this stuff:
EXTERNAL WORLD [HD] - DAVID OREILLY - YouTube[/ame]
And the larger point of posting this is the guy released All of the rigs for this animation recently. If you're interested in learning rigging (in Maya) this is an amazing resource:
65 character rigs all tackling unique problems etc.