Starboard SUP Sailhttp://www.standuppaddlesurf.net/
I took this video sometime last year when I went to visit Starboard in Bung Taco, Thailand. Svein Rasmussen, Starboard CEO, showed me this prototype wind sail.
Read the full article here: http://www.standuppaddlesurf.net/2009/06/27/starboard-sup-sail/