c0rd on 07 December 2008
Here are some crazies:
Wii Music: 8+ million lifetime.
Wii Fit: 21+ million end of 09', 35+ million lifetime.
Wii Sports Resort: 14+ million by the end of 09', 35+ million lifetime.
Mario Kart Wii: 18+ million by the end of 09', 28+ million lifetime.