This is cool. Lancashire-based Intelligent Energy are showing off their prototype hydrogen-powered motorcycles.
The Emissions Neutral Vehicle (ENV - pronounced "envy") will do 50 mph and has a range of 100 miles. It's also, apparently, dead quiet.
The 'bike's engine produces only water as a byproduct. It's expected that by the time of release, the range and top speed with be extended.
The aimed-for release date is somewhere in mid 2007, and price could be anywhere between $6,000 and $8,000.
But that's for a totally non-polluting, utterly silent bike that looks that neat.