Yesterday I test rode the prototype of a new Human Powered Vehicle (HPV). Named ElliptiGo it uses an elliptical trainer motion to drive the read wheel. So you ride in a standing position, looking much like a Segway rider while shushing your feet forward and back.
It takes a few minutes to adjust to the new set of muscles and movements, but it really does cruise along pretty well. Production models will be out shortly so I will have a chance to ride one of those too. I'll put up a picture of me on the ElliptiGo a bit later today.