Even though this was written for GURPS 3e it is still the best Vampire reference book a GM can have in his library. About every variant of the vampire described in myth, literature, and film than one can think of is represented here regardless of it being Dracula (Gothic), the being from Lifeforce (Alien), Boris Karloff's Wurdalak from Black Sabbath (Vyrolakos), Demonic (Succubus), or the "traditional" Europian vampire (Vampir).
Of the 47 different "species" of vampires listed 30 are actually described in 23 listings (several are simply different names for the same type of vampire). Each description gives the origin and habits of the vampire as well as its strengths and weaknesses.
Even if you don't play GURPS, Blood Types is still the best all around reference on Vampires.