Cool tip.
The most interesting thing is how to setup the bones to make a good warp of the texture to achieve easily the desired movements.
Can you show us the bone linking and its strength for this particular case?
-G
To be honest, I hardly ever use bones and the structure is pretty rudimentary. But here you go:
The two bones on top, pointing left and right, are connected to the upper middle bone; the bones down the sides are connected to the ones on top. Strength-wise, I think I used the default settings. That's pretty much it...
The girl was done entirely with point animation, so there's nothing really fancy involved in the turn.. was there anything about in particular you wanted to know about?