Ya got any?
I've got a cabinet full of books, photography and business, but one of my favorites so far is one called "you, inc. The art of selling yourself" Don't have it handy, so I'm not sure who the author is, but it's really good. A lot of it you'd think is common sense, but some of it was quite eyeopening.
I've also got " the new manual of photography" by John Hedgecoe, which I'd like to at least crack, since I paid for it.
I've got more...but the cabinet is behind the Christmas tree, so I'm not sure off the top of my head which are my favorites...