Hi Tim,
The story behind the netduino portion of the code can be found over here:
http://forums.netdui...no-cnc-machine/
The original code can be found here:
https://github.com/tgiphil/DazCAM
And you can find technical notes here (someone else wrote a wiki article about my configuration):
http://www.shapeoko....hp/Netduino_CNC
George's program makes huge improvements to this with visualization and CAD/CAM functionality. It's exciting to see this take on a life of its own!