Thanks for the interest in this. I'll keep updating it through the holidays at least. How interesting it becomes depends on how close things get. That's why I started out by breaking things down regionally. In Americas things are considerably different from everywhere else.
Digging my notes out of the recyling bin, I can give you the following cumulative numbers for Americas through Nov 15:
360 2008 = 1,074,160, while PS3 2009 = 1,212,294 so PS3 has a very slight lead in sales (47,134 units).
BUT
Whereas PS3 kind of collapsed in Americas last year (640,910 units) after Microsoft's price drop, 360 sales this year have held up pretty well and with the strong sales of the last two weeks are now almost as good as last year (1,062,568 units).
So... while PS3 has gained 149,726 on the 360 since September, the combined effect of the two years still has the 360 up by a net 374,524.
EDIT: Changed the final comment which was misleading. I'm confusing myself even!
