Big fan of diplomacy. And chess. And many other games. Someone mentioned Junta -- in the same humorous vein, there was also Wabbit Wampage and Wabbit's Revenge. But there's one game I really wish Games Workshop would re-release: The Fury of Dracula.
It's a cool game, based on the hunt for dracula in the original bram stoker book, but the best thing about the game is that one of the players is Dracula, and I've never played a game that helped me understand quite so well the standard villan mistakes from James Bond movies, among other things. It was such a cool, different game. Keep an eye out for it.
-jpj