I've been following the BIM troublemaker for a while now, and he pulled another one out of the hat. For some light reading, just check out this:

http://bimtroublemaker.blogspot.com/2011/01/complex-rigging-and-built-up-forms-pt1.html

and

http://bimtroublemaker.blogspot.com/2011/01/complex-rigging-pt2-skin-that-sucker.html

I thought I was pretty savy with Revit, but the Troublemakes is in a class of his own. I stand amazed.