Wow, almost exactly one year since I first posted this. Anyway, I'm going to bump this back up to the top, as my interest in R/C Drag Racing has returned. Take a look at these links for more info on the organizations behind R/C Drag Racing, the many classes available and a few of the Manufacturers of Drag Racing specific cars.
RODS Sanctioning Body
IMDRA Sanctioning Body
R/C Drags General RC Drag Racing site
Team Walbern Car Mfg.
Grand Motorsports Car Mfg.
Litespeed Engineering Car Mfg.