"A Week of Twilight": Werewolves vs. Vampires!

For today's "Twilight" article I decided to explore the seemingly eternal battle between werewolves and vampires. One of the major plotlines in the series is the conflict between the werewolf and vampire species. According the books, werewolves are the natural enemies of the vampires, and come into being wherever vampires naturally occur as nature's means to balance things out. The idea of vampires and werewolves battling it out is nothing new; the "Underworld" films also tell this type of story (although in a less-brains/more action-oriented way). But where did this idea come from? Has it been around as long as the myths of these creatures have?
Apparently not. The earliest recorded stories actually link vampires and werewolves together; in fact, one of the most common beliefs instructed that werewolves who died would, if their bodies were not properly disposed of, be resurrected as vampires. Other cultures believed that some vampires chose to become werewolves, and some even consider the two beasts to be one and the same.
Believe it or not, the earliest record I could find of vampires and werewolves being enemies is taken from a popular pen-and-paper role playing game series called "Werewolf: The Apocalypse." "Werewolf..." was released by publisher White Wolf, which was born in 1991 (White Wolf also created the popular RPG "Vampire: The Masquerade"). After this came the "Underworld" movie series, which many "WTA" fans argue stole the idea. And then came "Twilight." So there you have it.
Honestly, can't we all just get along?