Oyvoyvoyv on 03 December 2008
You have to read it carefully.
"According to our early estimates, over 1.7 million Wii and DS units were sold last week in the Americas"
And
"Microsoft will also be pleased with their performance last week, over half a million Xbox360s"
It is for the full week. So ioi slightly overestimated it. It could be that ioi thought that the 360s success would make it sell higher than usual on Saturday/Sunday, or simply just slight miscalculations.
They were just early estimates, and being within 10% of what you said is then pretty good.
Especially considering how spot on Wii/DS/Ps3 was.
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS
