My two penneth. Stand behind he ball on the tee, pick a target down the fairway, set up on a line with the target. Take the club back REALLY SLOW (very important) and then leather it, whilst keeping you eye on the ball until you've hit it. Worked for me this season. Still get the odd one drifting off but this routine has all but cured it. Just as a tester, last week I went back to my old routine, cos I wanted a bit of a rest from trying too hard, of step up, couple of swishes, step in, whip it back and smash. Then watch the ball sail off onto the adjacent fairway, screaming "BALLRIGHT, WAHOOOOOO"! Great fun, but it won't win you any comps.