Japanese software sales thus far (Famitsu)

– World Destruction (NDS, Sega): 80,377 units sold
Release: 09/25/08

– Wii Sports (Wii, Nintendo): 3,151,793 units sold
Release: 12/02/06

– Mario Kart DS (NDS, Nintendo): 3,220,432 units sold
Release: 12/08/05

– Disaster Day of Crisis (Wii, Nintendo): 21,464 units sold
Release: 09/25/08

– New Super Mario Bros. (NDS, Nintendo): 5,291,737 units sold
Release: 05/25/06

Source