-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.