Phil Mickelson DVD

His methods are great.  I almost hope it fades into obscurity so that I'll have to compete against fewer people who have studied his technique as closely as I have.

There are a few things that he never talks about that still helped me greatly.  Carefully examining the way he sets up to the ball, he plays almost every shot with a slightly (at least) open face.  This allows him to take advantage of the bounce on his club.  The other is the way that slow motion video allowed me to closely examine the way he sets up to the ball.  When I copied his setup positions, I began to get the same feels I've been getting from the address position of my full swing.