This kind of thing happens all the time... sales and shipments fluctuate, none of us know when MS or Sony send shipments out, for all we know MS shipped 200k the day before the end of the quarter, and Sony might have not shipped in the past 6 days or so.
It might even be the other way around.
My bet is that PS3 is slightly overtracked, somewhere between 200 and 600k.
VGC shows "stock" was 440k for PS3, and 810k for X360, so with the above estimates stock would be 640k (still fewer than 360 despite it selling faster wek on week, this would still indicate it was in poor supply compared to 360) or up to 1040k (more than X360, but comparatively more in that it sells more weekly, this indicates supply is about the same as 360)
^I am going to start using "stock" and "supply" differently from now on, my use of "stock" is how many units are out of Sony/MS/Nin hands (classed as shipped) but not yet sold from stores.
Wheras my use of "supply" will be to indicate how well it is "stocked" compared to how well is sells, (so poor supply for Wii would be 1mil units, but for 360 that would be ample supply, even though it is the same amount of stock)
