Did the DS not hit the thirty million milestone on the same week?
Roughly 1 in 4 people owning a DS (not quite, but I doubt multi-ownership is a huge factor) is very impressive. 1 in 12 owning a Wii, not so impressive, though it probably looks better in terms of 'households'.
A game I'm developing with some friends:
www.xnagg.com/zombieasteroids/publish.htm
It is largely a technical exercise but feedback is appreciated.