Only 294,000 Wiis sold worldwide last week. That is a huge number, but it is close to 3 times less than the number of DSs sold last week.
One reason could be the popularity of the DSi last week. However, I just did a check to see how the Wii has been doing lately and this is what I found (note it is hard for me to see exact dates and sales correspondences because I'm using a laptop). However it appears that the Wii has a drastic decline from the holiday period of a week where it had a peak of 1,769,817 to a point in mid January where it sold 502, 788, followed by several weeks in the 300,000 range (with a decline the last two weeks to 310,000), then last week's new low of 294, 876.
Are Wii sales beginning to fall off in Americas and Others as they have already done in Japan?
Heavens to Murgatoids.