So first VGC article estimated 360 to be around 481,000 which was way overtracked. If we divide this by the 4 weeks of January, then it is 25,000 per week. Which means that 360 was third behind Wii and PS3 in every week world wide.

It looks like 360 is selling 20-30 K more than the PS3, and not double as per vgchartz latest numbers including this month.