the lifetime to date # is getting a little overrated. it is most important because it gives an idea how many total users are out there. Why do you care how many users are out there? to forcast how much a new game can/will sell. if a console sells more then competitor every week AND sells more copies of new games that come out
SO, if PS3's week to week game sales pass the X360, then it doesnt even matter if the lifetime to date #'s are so different. And this is getting really close to happening.
Take a look at some new release's multiplats. The only one not close is COD4, which sells GREAT on FPS crazy XBox
DMC4
XBox :399,262
PS3: 463,562
Burnout Paradise
XBox : 304,546
PS3: 271,376
Turok
XBox : 162,236
PS3: 112,299
The Club
XBox : 20,661
PS3: 21,792
COD4
XBox :4,681,907
PS3: 2,299,630
AC
XBox : 3,359,695
PS3: 2,192,473
Conflict : Denied Ops
XBox : 18,549
PS3: 21,509