I know this is an old thread...but, after looking at the numbers so far, there is a very good chance PS3 will reach 35 mil before 360 reaches 40 mil. Or at most, the same week. We have PS3 with 34.74 mil, and 360 with 39.77 mil. So, if we use this week sales to set the trends, we have:
360:
39.77 mil + 92.9K = 39.86 mil (1 more week)
39.86 mil + 92.9K = 39.95 mil (2 more weeks)
39.95 mil + 92.9K = 40.04 mil (3 more weeks)
So, it should take the 360 3 more weeks to hit 40 mil. Of course, this is barring any bump in HW sales from Alan Wake. Though, judging by pre-order numbers, Alan Wake isn't going to be HUGE and therefore probably wouldn't result in a big bump, if any.
PS3:
34.74 mil + 134.79K = 34.87 mil (1 more week)
34.87 mil + 134.79K = 35.00 mil (2 more weeks)
So, it should take the PS3 2 more weeks to reach 35 mil. Again, this is using this week's numbers (or last week, however you want to put it) and doesn't include any bumps. Though, like the 360, I don't see any big bumps in the near future.
That is pretty impressive, especially since most (including myself) thought the 360 would beat it by 1-2 weeks. That gap is closing pretty swiftly. 