According to Famitsu (enterbrain), the DSi LL sold 103,524 units in 2 days. Sales days include Saturday(11/21 the first day) and Sunday(11/22).
http://www.famitsu.com/game/news/1229910_1124.html
It might have sold well on Monday too I'm thinking since Monday was a National Holiday here in Japan.
edit: It also says that lifetime DS sales (all versions) are at 28.19 million in Japan.
starcraft: "I and every PS3 fanboy alive are waiting for Versus more than FFXIII.
Me since the games were revealed, the fanboys since E3."
Skeeuk: "playstation 3 is the ultimate in gaming acceleration"