I heard someone mention recently in class that South Park uses Maya for all of its animation. I found this really interesting so I looked into it some more. Turns out, using Maya allows them to animate faster and without the need of overseas outsourcing. I tried to see if there were any step-by-step behind the scenes videos on how the animation directors do it but this was all I could find. It's from their "Heavy Metal" spoof from a few seasons ago. The footage presented as a Maya wireframe starts up at about 1:11 seconds. At the end they have all four stages of animation playing side by side: story board, wireframe, rendered with green screen, and then the final product. Check it out. Remember it is South Park so there's some South Park esque humor. Enjoy!