The Shweeb is a pedal-powered capsule that runs suspended under a monorail track. Apart from going a lot faster than a regular bike (this thing goes up to 90kph/56mph!), devices like these could, in theory, be a good eco-friendly way to move around cities, provided that a rail infrastructure would be built to accomodate them. Unfortunately for the rest of the world, the attraction is currently only available in New Zealand and will set you back about $30US for a 3-lap ride.