Found this thread via search function and had to "bump" it with some of my thoughts. I know it's old but there is good stuff here.
There is a lot of priceless info up there for anyone who has room to stand up and move their hips while reading.
I'd like to say that I've been reworking my drive to allow myself to get more power behind the ball. In the past, I set up with a slightly open stance, slightly closed club face, aimed left side of the fairway, and cleared my hips in the downswing before clearing my hands. This produced a 225-245 yard "power fade" that I grew accustomed to and "lived with." The harder I swung the more it faded, often with bad results.
I did some range work and got help from a couple of scratch players and we reworked my swing so that when I begin my downswing, my hands are the first thing to move. When leading my downswing with my hands my hips naturally follow and I can "slide" through impact. It was rough at first but holy cow does it produce a straight drive. Nothing like finding a gem like that on the range and then coming here to read up on it.
Thanks for the post!!