I can't believe how popular this game had turned out amongst the PC community, despite all the fuss about dedicated servers.
It's currently beating Counterstrike 1.6 and Source with amount of people playing. I have never seen this done on a FPS before. :/
Insane.
COD4 had several hundred thousand for about the first 6 months of its life (its peaked at 250 thousand this year alone), MW2 on the other hand hasn't broken 100K in its opening and arguably busiest week.