I posted this on my blog too - Most rigs i build and have seen have isolation at the head i.e switching the orientation space between the chest, torso and world. And also with position space too.
I recently saw a rig that pushed the isolation to the neck instead and was wondering if its the right way to go? If isolation is at the neck how does positional space switching work for the head?
And example of isolation at the neck:
And at the head:
http://www.youtube.com/watch?v=mxUWd2ZTh3Y (skip a little)
A giraffe for example has an incredibly strong neck, its able to lock on a target but also flex around.
A chicken on the other head is pretty much like a steadicam (isolation at the head) insane!: