Amazing.
the guy who Is riding the newest ones near the bottome lives a town away from me! i’ve got to meet him and ride one of these!
I’ve spent alot of time looking at these truly interesteing machines, this one site has more info than the rest of the web.
OOPS
http://www.dself.dsl.pipex.com/MUSEUM/TRANSPORT/motorwhl/motorwhl.htm
Forgot the most important part…
sorry, i suck.
I wonder if they have a forums for monowheeling. I’d like to make one some day (nowhere in the near future…don’t get your hopes up). Maybe I’ll aim for making one within the next 50 years. 
They look very fun.
Andrew