Today, I finished creating the Prop-1 to RC controller interface circuit. The schematic, for ExpressSCH is available here.
It works like a charm, all simple transistor logic, no relays, no nothing. Now, with a simple 3 lines of code in the Prop-1 program I can remotely trigger a prop ~30 feet away.
One cool thing of note, I submitted the schematic to the support forum for the Prop-1. The head programmer / developer gave it his ok, and complimented me on part of the design.