I spent many hours on that game and was thrilled when I heard Call of Duty 5 was coming out. Call of Duty 4 Modern Warfare is an Infinity Ward game while COD 5 World at War is a Treyarch game. They are both killer games and I still pay COD5 all the time. Inifinity is getting back into the development of this series with this new one - the sequel to COD4 - Modern Warfare 2.
This looks so kick ass and I can't wait for the release. It comes out 11-10-2009. Check out the trailer: