Alot of good advice has already been posted, but here's my thoughts anyway. I think the single most important thing is trigger control. I agree with Shane and some others that you really do have to focus and concentrate on that front sight, but if you can't "break" the shot without distrubing that front sight, all that front sight concentration won't matter because the gun will be pointed away from your point of aim at the moment it fires.
Actually, I think the best accuracy tip is two fold, and it involves both the front sight and trigger. Align your sights on the target. Focus on the front sight, let the target blur and let the rear sight blur, then "press" the trigger with a smooth, constant pressure untill the shot breaks. I'm betting you've read that a thousand times. I know I have, but for me at least, that's just what being accruate involves. Front sight/trigger.. Also, get yourself some snapcaps and dryfire, alot.. it will definatly help.
The only other thing I'd add, is take your time and learn to be accurate first, then worry about speed, if you can't be accurate going slow, you won't be accurate going fast. And you can't miss fast enough to win.. Good shooting people..
God Bless America !!
mavrick