According to BBC News, Nintendo has so far sold more than a million Nintendo DS since going on sale on 21 November 2004. I don't know about you, but that is a lot of DSes. Such figures would probably shut the doomsayers who were predicting Nintendo's death since 1994.
I am not surprise that the DS is a hit. I saw a commuter on a London bus last week and he had a DS (he got a US import) and design wise I think its a hit. He was playing a Mario game - can't remember what its called - and it looks fun.
Source: BBC News