Here's an interesting little Rayman Raving Rabidds Wii interview that I found. Rayman Raving Rabbids is set to be a Wii launch-title, so expect it anytime....soon?

All the games will support up to two players. About half of the games, say about 40 or 50, will support between two and four players. There's no split screen; each player will have their own character on the screen; and in the FPS games it's co-op style like House of the Dead or Time Crisis with four people playing on the screen at the same time

Sounds quite fun actually.