golfrewind.com

any1 have any drills to help keep your head still? im having a real hard time with it..........

*note* it usually goes down on the downswing causing me to hit it fat

Let me start off by saying that you dont want to keep your head still. When people say: "Keep your head down," what they really mean is: "Don't look up too soon." or "Keep your spine angle the same." There should be some movement of the head in your swing. Just watch the pros. That said though, try this drill and see if it helps with what you're looking to achieve.
When you approach the ball, assume the correct stance with your feet and knees in position but keep your head and back straight, bend forward slightly at the waist and look straight at the ball. If you try and take a swing like this, your left shoulder will almost certainly hit your chin.
While keeping your eyes on the ball, raise your head slowly until your left shoulder does not hit your chin on the back swing. Make sure that your head does not move from side to side by keeping your eyes fixed on the ball.
Slowly go through the back swing and downswing repeatedly with this in mind. Do not hit the ball but do your normal follow through. Practice this part of your swing focusing on keeping your head straight and eyes on the ball and this should help you with the extra movement you are trying to get rid of.

Good drill. I'd also try swinging without a club for a while. Trying to keep your head as still as possible. Just practice withough a club for ages and ages on end. And practice it some more. So you know for sure that you wont do it with a club. I also think this may be a mental thing you have in the back of your mind. (I.E. You step up to the ball and you think you're going to move your head) All you need is a mental block from this. Just try to forget about it and good luck.