One of the better self-balancing 2 wheel robot project I've seen.
Arguably good enough to implement your own "Segway"*
Full kit available - or part kit
Plus links to a very large amount of technical information.

~ 15 minute video with numerous links to detailed information.

>From start:

        http://www.youtube.com/watch?v=3DN28C_JqVhGU&feature=3Dyoutu.be

Good demonstration from here:

        http://www.youtube.com/watch?v=3DN28C_JqVhGU#t=3D210

* You'd need to scale this up 'a bit' :-).
I'd expect a Segway to have vastly more failsafe and stupidity-safe
features than this but this seems to be an exceedingly competent
implementation.


             Russell
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