It's called the "Scooterputer" ... and it uses parts from Adafruit, Liquidware, and Sparkfun, and all the source code is open source (I uploaded it to the Open Source app store site).
Kurt used the antipasto arduino ide, which brought a tear to my eye, thinking that all those hours slaving away with Chris getting that to work was time well spent :-)
This is a custom, homebrew shield Kurt made to house and connect up all the sensors:
Kurt has a ridiculously well written tutorial on how he built everything up on his site over here... and Make blog even picked it up, and there's a funny conversation about it over at the Arduino forums.
