Somewhat cool, considering that it's on a motorized vehicle, but most of those tricks can be done by any competent freeride mountain bike rider.

For a REALLY impressive look at what can be done on 2 wheels, check out anything Ryan Leetch has done:

http://www.youtube.com/watch?v=1F7z4HxpWfA&mode=related&search=
http://www.youtube.com/watch?v=4K3w7zfyrL0

And for a real treat, check out what he does about 50 seconds into this one:

http://www.youtube.com/watch?v=wehmNVja_aI&mode=related&search=