if someone is interested at the address below you can find a little project to build an interface for connecting your RC radio to the PC via USB using the new USB flash chips 18F2455/2550 from Microchip:
formatting link
a radio with PPM output and at least 4 channel is needed.The project is totally free... on the site you can find the binaries, sources, schematics and layout of the circuit. The circuit uses SMT components.
ciao