Activision Blizzard announced that Modern Warfare 2 has passed the $1 billion in sales mark, which is a tremendous milestone for an intellectual property. The return on investment must be huge, and Activision is rolling in dough. Even more impressive is that MW2 has only been available for a little more than two months. This is the second billion dollar game from Activision, with the first being Guitar Hero 3. Not to mention World of Warcraft, which is reported to rake in $1 billion per year from monthly fees. The game industry is certainly suffering as a whole, but Activision seems to be doing better than everyone else.