Activision has announced that registration is now open for the Call of Duty 4: Modern Warfare 4v4 Tournament sponsored by the Global Gaming League (GGL.com). The Call of Duty 4: Modern Warfare 4v4 Tournament will take place on both Xbox 360 and PS3, so players can choose either one to join (but not both). Each competition stars with a points-based ladder, where players challenge others in the ladder, play matches and report their scores to earn points. Gamers will start off with practice ladders running from now through Sunday, December 9 so that they can form teams and practice. On Monday, December 10 the ladders will be reset and the official competition will begin. The ladders close on January 13, 2008 and the top 64 players will move on to the final competition. Gamers will get the chance to win a 32” 720p LCD HDTV, a digital 5.1 channel home theater system and cool DVDs for each player on the winning team. Visit this page for more details.