Thanks a lot for the link to this amazing free system, David!
I think that’s gonna be hard to beat. Does the system allow setting up a double-knee leg for a biped, to spread knee rotations over two joints for more anatomically accurate deformation? I did not notice anything like it in the vids I quickly checked out.
For bipeds there's also an automated system for Jason Schleifer's "Animator Friendly Rigging" available [here](http://www.creativecrash.com/maya/downloads/scripts-plugins/character/c/automated-animator-friendly-rigging). I have only briefly tried out the latter, since I use my own scripts, but on a first-look basis, it seemed like a pretty nice system.
Cheers!
