Activision today announced that Call of Duty 4: Modern Warfare will invade Xbox LIVE for a 72-hour Play & Win Sweepstakes full of games and prizes beginning on Friday, Nov. 16 at 12:01 EST. Hourly prizes will be awarded all weekend, including Call of Duty 4: Modern Warfare shirts, Infinity Ward autographed posters and Xbox LIVE point cards. One Grand Prize winner also will receive an Xbox 360 Elite console and a Limited Edition Call of Duty 4: Modern Warfare faceplate, among other items. Press 'read more' for details - the PC demo can be found here.