@slowmo, well actually Microsoft made:
1) An additional 60Gb value for pro model(299$ elite) in August.
2) Then Microsoft did a 50$ rebate for those models during Halo 3 ODST release.
3) Then 1(2) week(s) 99$ walmart offer for arcade models.
4) Then MW2 elite bundle.
I think, Microsoft did almost everything, to stop the gap decrease.
But those 2 weeks have ended, i expect now around 200-220k sales for x360 and around 400 for PS3 for this week.
If not Walmart deal and MW2 bundle, x360 now would be much less compared to ps3 2008. And so far, the difference in x360 favour is not that big, that`s why i think my maximal x360 limit for 2009 is right.