Activision today announced that Call of Duty 4: Modern Warfare was the #1 title worldwide, with more than 7 million units sold during calendar 2007, according to The NPD Group, Chart Track and The GFK Group. Call of Duty 4: Modern Warfare promises to arm gamers with the most advanced and powerful arsenal of modern day firepower to fight a new war in the world’s most treacherous hotspots. The PC demo can be found here.