I dont know if it has been mentioned yet, but right now I am reading Andre Norton's No Night Without Stars, and I must say that I am thouroughly enjoying it. My favorite post apocalyptic books are post nuclear, and have mutants and radiation in them. I know that technically this is science-fantasy. We all know that if there were a nuclear war and there were mutations, the vast majority of mutations would not be good. But I still enjoy this sort of book. Reminds me of one of my favorite role playing games, Gamma World.