Also, from Neo Gaf
Modern Warfare 2 (360, PS3, PC) sales based on first week:
Weeks:
46 - 1,780,000
47 - 249,000 (-86%)
48 - 169,000 (-32%)
49 - 158,000 ( -7%)
50 - 140,000 (-11%)
51 - 144,000 ( +3%)
52 - 169,000 (+17%)
Total: 2,810,000
Chart-Track months:
11 - 2,029,000
12 - 781,000
http://www.neogaf.com/forum/showpost.php?p=19070271&postcount=17