http://nexgenwars.com/how.php
from the link:
The console sales numbers you see on the front page of NexGen Wars are estimates, and are not intended to represent exact, down to the minute sales as only Microsoft, Nintendo, and Sony know the exact sales figures of their respective consoles. What we do here at NexGen Wars is compile numbers from NPD, Media Create, ChartTrack, as well as various other sources. We then take these numbers and, based on past sales trends, extrapolate the numbers out to give as close to real-time estimates as possible.
so they're an estimate. a good one, but still an estimate. This is why the numbers will sometimes fall steeply after having gone up a while.
Incidentally, vgchartz seems to be down.
Yeah, that's odd. They've never been down before as far as I know, and they were up when I posted the link.
:
So I guess that the VG Chartz numbers must be an estimate of some sort as well, but when the race is so close, for one site to list one console in the lead and another site listing the other, it just seems odd to me.
Until I saw your signature I thought it was common knowledge that the Wii was mopping the floor with the 360 (especially considering the 360 had a full year on the Wii). Like I said, I thought there was even some kind of official announcement made recently when the Wii finally pulled ahead. But maybe I'm wrong.
I'm still interested to hear where Keranu heard that the VG Chartz site is "flawed." I've always visited them for all my console-race needs!