I am going to put a plug in for Eric Jackson's
Rolling and Bracing:
Here is a you tube task for his teaching style:
He uses a different technique, but I really like how he breaks it down in to phases where you can do drills. He also has a section on the DVD for teaching others. I have been able to teach myself and a couple friends how to do it with this, and the DVD is quite a bit cheaper than classes. And once you get a reliable roll, it is much easier to modify it how you like.
There is alos a thread on his style vs C-C here:
EJ's rolling/bracing method is very different than C-C