http://www.gamasutra.com/view/news/26856/Analysis_Wii_Overtakes_Xbox_360_LTD_Software_Sales.php
From Gamasutra's analysis of total software sales in the last months of 2009, they were able to derive, tentatively, that the Wii's total software sales, from launch, have finally surpassed the 360's, negating the last advantage of the 1-year lead time that the 360 had over its competitors.
I figured it was inevitable, but its still a nice milestone.
Monster Hunter: pissing me off since 2010.