Hi my first post, also my first time playing with an Arduino Pro mini, I'm not much of a codie.. yet, although I have messed with some PIC basic. The guide is encouraging me to have a crack at it. I purchased the Arduino & usb breakout to load a specific program for the Arduino hooked up to the Wii motion+ and Nunchuk for helicopter stabilisation, this project with the open source code, is giving better results than most of the expensive heli stabilization systems out there 
plus I can tweak the code to suit my setup, something rarely offered with commercial systems.
I've ordered a couple more Arduino's so I can have some spares to learn as many code examples as possible.
Many thanks for this great guide.
Steve .. Arduino n00b