I've really been been enjoying the freedom and ease that ZBrush's ZSpeheres offer for rigging and posing. I always used to have to painstakingly set up the skinning and posing using Max's biped and Character Studio, which would take ages to do and never really gave me great results (probably because I'm not a character rigger).
I find this works so much more easily and not to mention quickly for what I need. It took roughly 10-15 minutes to create this rig, and the best part is that it skins the character on the fly. It works incredibly well; even really hard areas to rig and manipulate like the shoulder areas are no problem - the arms rotate upwards and the mesh deforms with no problem.
There are still a few areas to pose and tweak: the hands and fingers haven't been touched yet and I might still tweak a few other areas. Once the ZSphere posing is done, I'll do a bit of clean-up sculpting to areas where the muscles have deformed and shifted and then also give the her an expression of some kind.