I've just finished reading Jim Hardy's book, The Plane Truth For Golfers and it's been a real help to me. Although he prefers the One Plane Swing swing, he doesn't denegrate the Two Plane Swing. In fact he emphasises that either swing is suitable, you just have to work out which one is for you. He gives full instructions on both and the main aim of the book is to seperate the two swings so you don't get elements of them mixed up; which is exactly what I've been doing. Since reading it, I've gone back to the 1PS, which is what I started with and with the instruction from the book, I'm hitting the ball more consistently and further than I ever have before. A lot further.

I highly recommend this book, whether you are One Plane Swing or Two Plane Swing, you might find you're mixing elements of the two without knowing it.