There are a few good articles and mentions of Wattbike around the web, I have listed some of the interesting ones here:
Norwich Wattbike League – photos and results at http://www.lotuscycleracing.org/
Altered Images doing some interesting things with the Wattbikes - http://www.alteredimages.tv/revolutions/
Lichfield Wattbike League Report on the British Cycling Website
Riders out in force for the Wattbike Challenge at the DHL sprint day - on Retford Today Website
Phil's Road Biking Blog - Spinning Classes at the Manchester Velodrome