This is the most difficult concept for me to get when it comes to the golf swing.
As anybody can tell from reading this thread, each person describes what they do using a different vocabulary. In my opinion, the most vexing concept is that of aiming point. Just exactly what is being aimed, and how is it being aimed? Are the eyes focused on the aiming point? If not, where are they focused. I am currently working on Tom Tomasello's (demonstrated in the Lee Deitrick video letters in the gallery) idea of throwing the hands down and out on the plane from the top. This approach takes the lower body out of the move except for following the momentum generated by the hands swinging the club. It is hardest the me to do with the driver so I will continue to practice.