http://www.standuppaddlesurf.net/
I've had a few breakthroughs in the past month or so by talking with a few experts on paddle technique and downwind racing tips. One of the experts is Todd Bradley who has over 40 years of competitive paddling experience.
Read the full article here: http://www.standuppaddlesurf.net/2009/08/05/todd-bradley-teaches-proper-paddle-technique-video/