Hi folks! I'm looking to expand my library with games to play with my friends and my other half. The best multiplayer games (IMHO) are coop multiplayer games, of any genre, but they're relatively few and far between. What are your favorites? I only own a Wii (Wii and Gamecube compatibility) and a PS2 (and of course, a wonderful Mac), but I'm curious as to your favorites. Most of the great games that come to mind have pretty solid single player, sometimes even fantastic multiplayer, but rarely co-op multiplayer.