The Futaba company (popular for remote-control devices, servos and so on) has a control bus for their newer products that allows an easier method of wiring multiple servos, batteries, controllers and so on - called the "S-BUS". Being a proprietary system you'd be stuck with their parts - however enthusiast Michael Baker has worked on the reverse-engineering of the bus - and created some example sketches and an Arduino library to allow control of the Futaba devices with an Arduino.
Well done to Michael and all those who contributed to the project. For more discussion, library and notes visit the Arduino forum. And we're on twitter and Google+, so follow us for news and product updates as well.