460k divided by 31 = ~14.8k per day. 400k divided by 4 = ~100k per day. I'd say that is handily outselling the DS during the first 4 days it was tracked for March.
7 days. The NPD period was until April 2. And selling more per day seems kinda sad compared to what you'd expect from a launch.
There has been no buzz around the 3DS launch compared to previous launches, I don't know if this is because of a lack of consumer interest or a lack of marketing on Nintendo's part, but I doubt anyone at nintendo is excited about the way the 3DS is going atm.