Here's some quick R&D I've been doing into simulating some 2D rigs from a 3D rig. The main intent was to bring some sort of Spline functionality into Maya. It's still early, but I might end up working on a toolset to handle this sort of thing in the future.
Model and animation are from the insanely talented team at Thar be Monsters (http://www.blubberbustersgame.com/crew/)
For the game: http://www.blubberbustersgame.com/
You can view more of my work on Blubber Busters here: