I don't really have a lot of photography books, but these are my favorites:
"Workers" by Sebastião Salgado (no need to comment on this one!)
"Shooting Sex" by Bob Carlos Clarke (even funny and somewhat useful to read...)
"Belles" by Hervé Lewis (pure beauty)
Then there is a book which I really want to buy but haven't found in any stores which is "Serge Lutens" by Serge Lutens. I have only seen two or three pictures from this book and still I want it, I must have it, and I will get it some day!