How Stuff Works provides an overview of zombies, including some interesting info about Clairvius Narcisse, supposedly a verified zombie, and the ingredients of Haitian zombie powder, which may have ingredients scientifically proven to produce feels of paralysis and disorientation.

How Stuff Works also has an overview of vampiric creatures around the world, with an especially interesting segment on ancient Assyrian and Babylonian creatures.

The same site also discusses werewolves and the influence of Hollywood on traditional beliefs about these shapeshifters.