I don't know if this is npd, but this article says 2 million Wii last month.
http://latimesblogs.latimes.com/technology/2008/12/wii-fit-ds-nint.html
Nintendo sold more than 2 million Wii game consoles in the U.S. last month, more than double the number it sold in November 2007, according to Reggie Fils-Aime, president of the Japanese company's North American division. That's a record number for a month that isn't December, when the bulk of console sales happen, and it's about one-third more than the 1.4 million to 1.5 million that analysts had projected.
Nintendo's winning streak extended to two other products, the DS hand-held console and Wii Fit, a game that encourages players to exercise. Nintendo said it sold 1.57 million DS consoles, up from 1.53 million last year, and more than half a million copies of Wii Fit, which launched in May and has been in short supply ever since.
