Yeah, I was looking at the UC forum earlier for the same reason. I have Ina May's Guide to Childbirth and I'm thinking about picking up Emergency Childbirth. I don't want to get anything that is specifically for people planning a UC that won't be as handy for someone who ends up with an accidental UC, though.
I think that one of the really important things that I read before my accidental UC, was that 99% of the time in births that move so quickly as to have an accidental UC, it is because everything is going *perfectly*. So, while I had some moments of near panic while dealing with the intensity of the quick-moving labor, I never once panicked because the MWs were not there yet. This is not to say that you shouldn't be informed to your comfort level about the physiology of birth, but that if things do move that quickly, it is probably because everything is working perfectly.