USA: 360 Outsold PS3 by 100,000 Units in November (NPD)

[NJ5]

So NPD's numbers are:

360: 819.5k
PS3: 710.4k

While VGC's are (taking 10% off to make it USA only):

360: 724.5k
PS3: 756k

So according to NPD, VGC overtracked the PS3 by 6% and undertracked the 360 by 12%. Not as big a difference to make VGC wildly inaccurate.