I saw one of those here in Reno. I think there is a shop in town here that sells them. I think they are kinda wierd lookin. I'm not sure I actually like them yet or not. However, I am fond of the idea of something that gets gas mileage like a motorcycle, but is maybe a little more enclosed, and thus, safer. I think someone needs to make a working Light Cycle.
EDIT: Well well, it looks like this company is actually trying:
http://www.monotracer.com/
Bart