Just today, we learned that the total DS sales in Japan had (probably) reached almost 17 million. It turns out there's another milestone nested inside that number! According to Famitsu, the DS Lite is responsible for 10 million on its own as of this month.
It's not surprising that the DS Lite is responsible for the majority of Japanese sales. At this point, the only thing holding Lite sales back is production. Still, we'd be jaded if we didn't think 10 million sold in one year was awesome. And that's just Japan! Worldwide, it's over 22 million.