Here's something I stumbled across on you tube,

weird looking one wheeled bike - really cool technology

though. Here are two links both worth a quick peek...

 

http://youtu.be/Z1YoCfm7nxU

http://youtu.be/up3kvlkTka0

 

Sorry guys you'll have to cut n paste the links as they don't seem to go straight to the video when you click the link.