Milestone: Nine million copies of Call of Duty 4 sold

Since its November 2007 release, Activision’s and Infinity Ward’s Call of Duty 4: Modern Warfare has steamrolled competitors both on- and off-line. Already knocking Halo 3 from the top spot on Xbox Live for the past three month, COD4’s international success has resulted in more than 9 million units sold so far….