I wanted to use my helicopters RC for simulators at the PC. But the results with Propolus et al were quite unsatisfying. So using some bits of the V-USB library from open-dev and arduino.nl I cooked a PPM-USB-joystick the finally is precise enough to be really used in a simulator.
More details, scheme and source code here:
Thanks for posting your project, it came just in time to help me with one of my little projects.
Korman