Serve sequence
Click on the photo to go to Flickr to check out the serve sequence. It's interesting to follow the arm position and weight transfer.

look behind the point of contact for as long as I can, before my shoulders turn my head towards the net. It does seem to magically work; I'm not going to try to figure out why. I need to figure out how to replicate the very weird feeling associated with looking sideways on the backhand (because on the forehand I actively seek to press my chin into the right shoulder, whereas on the backhand I'm sideways to the net and square to the ball; need to look at some Federer backhand photos). Ok, looks like his head is leaning just a bit to the left, looking over the top of the racquet: