@CDiablo: What you are saying it's pure nonsens. Look hot X360 did last year in US :
http://vgchartz.com/hwcomps.php?cons1=Wii®1=------&cons2=PS3®2=------&cons3=X360®3=America&start=38984&end=39110
The best week is the week ending 25th of December. There are four or maybe five great weeks before each console. The sales are just starting to explode you will see bigger numbers in following weeks.