This is all great info. I, too, have a ruptured disc in my low back (not snowboarding related,) and thus far, my main way of not getting hurt on the hill is to fall on my face, or a full body crash on my back.
But seriously, I guess I've just been lucky not to land square on my tailbone. EatRideSleep, where do you get that supplement? You may have mentioned it already, and I just didn't see it...