Howdy.
I use 3DS Max, and I've made my characters, rigged them to a biped, the whole shabam. Unfortunately, the biped is lacking in the jawbone area. Any way I can get my guys' mouths to move?

You'll be much better off asking this at someplace like CGSociety [cgsociety.org]. Not too many 3DS wizards skulking about here. But it's my understanding that after you set up the biped you're supposed to use morphs to achieve facial expressions and mouth movement. This will prove tedious if you didn't already create the model with these morphs in mind (lips should not be one contiguous mesh, you should have a denser polygon count in areas that will stretch and bend like especially around the mouth and eyelids, that kind of thing). If you didn't already plan ahead for the morphs, you may end up having to remodel the heads from the ground up.

But again, you're best finding a site that specifically deals with modeling issues or better yet (if you haven't already) getting a good book on character design with 3DS Max.

Hope that helps.

Sounds absolutely awful. But thanks, I shall ask around there.

Bleh! This comic is more effort than it's worth.