Saw some of these videos posted on YouTube. A nice one from one of the 'Mt. Rushmore' instructors of 'The Golfing Machine.'
You can find more at http://www.youtube.com/user/bendoylegolf
With the new discoveries from Trackman and D-Plane, one of the things that Brian Manzella has been emphasizing is getting golfers to either get curb their amount of shaft lean at impact or if they have the shaft lean, get them 'swinging left' because shaft lean tends to cause a hook. Manzella has mentioned that Doyle has always been against a lot of shaft lean at impact, something well before the Trackman came out.