There is something seriously wrong with VGChartz numbers, not just in the US but here in the UK. Charttrack have reported that the PS3 has outsold the 360 for 4 weeks running; and this is backed up by charts at big retailers like amazon.co.uk and play.com. Its alsop apparently outselling 360 by 7 to 1 in France.
Fact is 360 is behind PS3 in its strongest markets (US & UK), and this is before MGS4 is out. Game Over, bad word of mouth has finally caught up with them.
I think VGChartz needs to start adjusting its data.