Huck:
I once heard someone say this: The difference between the fade/banana that many players hit off the tee, and the ones the pros hit, is night and day. I'm incapable of hitting anything other than a fade with my driver, and on my very good days, I can sort of tell where it's going to end up. On bad days, it just takes a big right turn and ends up miles from the fairway.
So, after hearing that, I went to the first round of the old GMO tourney in Milwaukee (the one Tiger made his pro debut at) and sat directly behind the tee to watch about 20 players tee off on a slightly doglegging hole that required a fade of some sort off the tee, and long enough to require either driver or 3-wood for the big guns. Sure enough, almost every single one of them had this perfect fade -- just a cannon shot from the tee, and this perfect little fade at the end of it. No big banana-like curves to the shot, just a touch of a fade, right when the ball reached its apex, for a soft landing in the fairway.
I thought, that's the difference.