According to Microsoft, Call of Duty 4: Modern Warfare has now retaken the #1 spot for games. This sent Grand Theft Auto 4 down to 3rd place. Apparently, COD4 has passed the 10 million copies sold mark. In response, Microsoft will be holding a Double XP Weekend this weekend starting Friday morning and going till Monday. This will be available in all playlists, and will be on both Xbox 360 and Playstation 3.