3dmotive has released part 2 or their series on bipedal rigging.
In part 2 of this series, Justin Harrison returns as your instructor as he walks you through the process of rigging a bipedal character from start to finish. Justin covers creating IK handles, Constraints, Reverse Foot setup, painting skin weights, creating set driven keys, as well as cleaning up your rig. And just as with any other 3dmotive tutorial, all the source files are included.
Read more about it here: http://www.3dmotive.com/new-release-bipedal-rigging-course-part-2/
And as always, a thanks goes out to 3dmotive and Justin for putting this together.