I love the SSR novels, and the adaptations, real sad they never found room to do any more - I guess Carlos was just too busy drawing Strontium Dog and Judge Dredd to squeeze any in!
Slaine isn't adapted from any specific book as such, but it's more or less explicitly derived from various Irish and Celtic myths, isn't it? Some episodes more directly than others. And A.H.A.B. was very explicitly Moby Dick in SPACE. Does that count? I bet there are other literary things like that going on.