I attended Ed Hooks 'acting for animators' workshop at last years animex festival.
After the blocking out stage of the animations i wish to produce i will again touch on Ed hooks, for his advice on facial expression and eye movement.
In preparation for animating however i will take a brief look at Power centres.
Ed Hooks spoke of using power centers as a means of expressing character. A simple example would be a sporty masculine type. Full of testosterone, this characters power center would likely be in his chest. Most comic book superheroes have their power center in their chest.

In the above picture the power center would appear to be right infront of supermans chest pulling him upright and straight.
Characters emotions can be portrayed through the pulling or pushing of the power centers. The dont always have to remain in one place and can shift to reflect loses in confidence or sudden resolve simply by changing the position, thus changing the focus of the characters posture.
These power centers can be used to lead movement, and define personality, is a character being lead by their head or their heart? Standing tall or sinking with depression? Power centers can create more variation in characters and contrasts.
Examples could include the nose of a dog, his movements literally being led by smell (this could also work with a waiter, for a pompous, contemtous look), or the feet of a burguler as he cautiously makes his way around a house, his feet stretching before him as far as he dares, the rest of his body bein dragged along.
Definetly seems like somthing worth experimenting with...