Former APT student Olivier Ladeuix has put together a nice collection of rigging video tutorials based on the abAutorigger from Supercrumbly. It's a pretty good system for those who want to rig up their own characters, but may not be riggers at heart. Olivier does a nice job of thoroughly stepping through the process. Super extra bonus points because he uses my favorite TF2 character, too! (which is another reason I dig Valve- we release our rigs and assets to the world to play with. Not many [any?!] film studios are willing to do that.)
Here's his first part (there are 4 parts to the entire series).