Solar Sailor

The Solar Sailor, a passenger boat that can be powered by solar panels, and whose movable wing-like solar panels can also act as sails. The craft can run on wind, sun, battery, or diesel, or any combination of them all. And the best part is, it's not vaporware. It was first showcased at the 2000 Olympic Games in Sydney, and according to the Australian government's Department of Environment and Heritage, "It is the first vessel to be efficiently fueled by the dual energies of the wind and sun and is now operating commercially on Sydney Harbour."

Source: worldchanging.comAdded: 17 May 2006