It's a surfboard, but I'd guess eventually we'll see one for behind the boat:
http://www.surfworld.us/aviso.htm Got a chance to see one at KillerDana down in Dana Point. Extremely light and it will make your wallet that way too - price tag was $1,500. Burned my hands when I picked the board up.
One of the things that I thought was interesting was that you can also custom order various flex patterns.