I want one of these....
 

The 1:1 ripsaw would be the ultimate but this is a little easier to imagine.

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http://www.youtube.com/watch?v=9amT7YvKhIU

That thing is pretty cool! I wish we could see a detailed build there and some more extreme bashing like the 1:1 Ripsaw!

heres a dumb question.. how does it turn?

It just speeds up or slows down a track to turn. ;)

A little off-topic, but are there any treads similar to that, but can handle high speeds?