To me
1 - Shipped Numbers - the definitive source
2 - Media Create/Famitsu/NPD
3 - ??????
4 - VGChartz (and no, I'm not in any sales thread, not that I think it's wrong to be ^)
I say this, VG chartz instead of a tracker, should be the ultimate place for sales related info. For example, there's a released interview that a dev told how much they shipped for Assassin's Creed PSP (pretty overtracked here, naming one example), but to find it, you have to turn the internet inside out again and again. There should be a place, where all that official info, plus Financial reports, sales forecasts, leaked numbers, media create/famitsu, everything of that nature could be found, easily.
To me it's kinda ridiculous to get sales info, and then having to wait for "confirmation" 1 month later. It doesn't matter if a particular number it's tracked great, because it always can not be, so what's the point of assuming that it is right?
