I know this has been discussed thoroughly. Howver the recent post of the djokovic tennis lesson on utube adds some perspective. On the one hand there is the idea that you shoot from the elbow and the wrist plays a passive role. On the other hand is that the wrist plays an important and active role. Up until recently i was in the former camp. I never really used my wrist. But you can see here in the djokovic video that he says, "at the moment of impact the speed and pace you get is from the wrist". Also, the person with the fastest serve I know said he uses his writs as well. He can hit a 130mph serve. The person I know also said he uses his wrist to place the ball. I wish more pros would post videos like this. Thanks Novak!