These guys have been at it for a while now, and are selling commercially here in Canader... i don't now about the US... but you guys always get the cool bikes after us!
And a video... MotorcycleUSA ZERO Test Ride
I like the idea of stepping away from dyno fuel, and there is a new generation of Lithium Ion batter MIT is working on that recharges in a fraction of the time conventional batteries do, and that leap forward will make alternatives a reality.
I think these guys are really on to something as well. http://www.betterplace.com/
They make car ownership and battery ownership a separate issue, and have refueling stations that swap the batteries for a fully charged unit in just over a minute. They have joined with Renault
who have invested a billion into making a fleet of new, conventional looking vehicles to work with this technology... and it's coming to market now
The genius of Better Place is that it separates car and battery ownership. You buy the car, then rent the bateries on a cell phone like contract based on mileage and use. For heavy consumers like taxis, some municipal vehicles, and even those who use their vehicle a lot, the car can be had for free if an extensive enough battery contract is needed... much like your cell phone today. You can charge the car conventionally at home or on long trips, pull into a switch station and get a new battery.
Here is a video of their idea in action. It's pretty slick.
I used to think Hydrogen was the bees knees, but the logistics of it are difficult to overcome, and seeing as how the plans are to produce it using fossil fuels as it's base, just puts me off the whole idea. Electricity just makes more sense.
There is a company in the UK who are designing rechargable batteries that are so durable, maleable and flexible that they can be constructed into whatever needs their energy. In other words, the body of your cell phone might be it's rechargable energy source in the near future, and this can be applied to much larger things as well.
I am looking forward to when they make roofing shingles a connectible solar device that feeds the grid.