Nintendo must really be weeping, if you look at totals for this year in Japan, + December 2007, you see that Wii fit has only sold 1979K, while the total Ps3 software sales, yes everything of it, has sold 1674K.
What a shock for Nintendo! Wii Fit was barely able to defeat the entire Ps3 library, a hard shock for Nintendo.
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS