GFK data, this is I think the most useful:
By September 30th
Wii 244k (184k since March)
X360 149k (30k since March)
etc - all close enough to vgc figures that I am not going to worry.
So this Nielson article is false, maybe based on polling users rather than measuring actual sales - hence the percentages and no figures.
Those data gave Sony them, and according to they said, removed from gfk. I I have not seen no official report of Gfk, giving those numbers.
The only official data that we have, are those of AC Nielsen. And it is a company very respected, his numbers are not false, if they went it would not be to so many webs.
It does not seem to me, that the only data well that of VgChartz in Spain, are those that said Sony, when everybody knows that here the Wii is sold much more that the PS3