I like your model. However I was trying to load it into Unity3D 4 and use it with Mecanim

http://unity3d.com/unity/mecanim/. It doesn't seem to like the rigging from the waist down.

I don't know enough about Blender to determine what is wrong. Perhaps they are facing the wrong direction, or not weighted. Any suggestions for a blender noob. I would be very appreciative.