Valve: Left 4 Dead 2 sells over 2 million retails copies in two weeks.

[donsterydo2]

L4D2 on X360 should outsell L4D because of its release date - just before BF and a month before Christmas it will help to keep high sales. L4D has legs even now so it looks like it's a trend for the series (we must remember that L4D did hit almost 2.5m on X360 in only a year, without bundles).