Xander has been updating his RobotC driver suite for as long as I can remember so I guess it is about time he put together a "how-to" to actually use it :)
http://botbench.com/blog/2012/04/11/robotc-driver-suite-tutorial/
He goes through how to setup RobotC to use the drivers, how they actually work as well as some examples to get you started. So if you have a sensor that perhaps is not supported well in a different language, think about giving RobotC and Xander's drives a go