http://www.smartplanet.com/blog/global-observer/air-powered-motorcycle-has-arrived/1592
Sounds like it would be quite nice around town. Would love to see one of them in action!
more here 
smiled.
smart 
Very smart, great concept. What will be even smarter is if they figure out a way to convert the bikes momentum under braking into a means of compressing air and feeding it into the tank to increase range and provide a sensation of engine braking, whixh I’m guessing it couldn’t have at the moment.
If the range got to 50miles (and assuming this ever went into production) I could commute for free with a couple of miles reserve, and I like that idea very much.