Thanks to skater_j10 for sending in this RC Tankbot project. It was created for Solarbotics but he added some additional details about the system on the project page. This tank looks like a great build platform for mobile projects.
“In terms of cost, this RF network system seems to compete with even the most low end RC transmission systems. And even though you don’t really get a physical controller with this system, it is a lot more flexible and versatile than a standard RC link. As a theoretical example (that we still might do one day) we could have had a complete diagnostic link between the tank and controller with the Tankbot sending sensor data and battery power results back to the controller for real-time, remote results.”