Does anyone have it working in Armed Assault? I can of course get it to move my weapon in game...but not independently control my head while my mouse controls my weapon. Any suggestions?

It's not very suitable for fps.. at most you can use it to control leaning around corners
In this mode it is used to control keyboard keystrokes as the thing it tracks moves into various quadrants in the field of view of the webcam

In the normal tracking mode what it does is takes over control of the mouse. So it is more suitable for flight sims where the mouse might be used for freelook
So in this way it is still usefull for while in vehicles in arma.. but it CANNOT be used to control the freelook of a soldier while mouse is used for weapon aim