At GDC, I was able to go to lots of talks. This one unexpectedly grabbed my attention in an awesome way! Mixamo is a service that allows you to create an enormous combination of male and female characters that you can model out, rig, and animate just about automatically so you can create tons of useful custom game characters in a short period of time.
The main services are FUSE for creating character models and the Mixamo site for animation and rigging services. There's even a Unity app that lets you browse and test animations before using them in your engine from the site on the fly.
Hit the jump for video tutorials on how to use FUSE and the Mixamo service...
My favorite feature is the fact that you can customize the character models to your custom characters with mudbox and that the face will also be rigged procedurally along with the body if you want it.