-These do not include Canada sales
-Star Wars Battlefront: Renegade Squadron is a pack in
-DS hardware is intentionally 10% or so higher
-Guitar Hero III on 360 presumably has a stand alone version as well, so not as different as it first looks.
I believe NPD have been undertracking Xbox360 for the last few months so I'm pretty happy with the comparisons - we are intentionally tracking higher than NPD on 360.
Note - I WILL NOT be making any major alterations to our figures in light of NPDs information. Most software is actually almost identical and it is 360 software we disagree most on.
If you dont plan to make any alteration to the hardware sold then you will end up with a massive difference with NPD .If you want the site to be accurate you should do the appropiate changes .Nobody will take the site seriously if there is a 1 million difference in numbers ,specially having the NPD ones at hand .
The "I believe NPD have been undertracking " X360 dont work either .I could do (hypotethically ) my own site with the numbers I "believe " too .