This is interesting. And with you, I'm sure there's gonna be a butload of graphs.
What is interesting here, is that I see the console with the biggest YoY increase this far, to have the lowest YoY increase in the holidays. That's odd really.
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS