combat arms will drive you nuts. imho its inferior even for a free game. not to bash on those who enjoy it, its just not for me.
anyhow, if you play cod4 on a pc, check out
www.thesocialmisfits.com. i play in that clan under the name -SM-Ewok. we run a 24/7 crossfire server and also have a vent set up should anyone decided to get on it.
cod5- i beta tested it on the pc and im horribly under impressed. it was buggy as hell. i have yet to pick up a new copy but nearly every single person in my clan is having some type of major issue with it (one guy had all his info get erased each time he quit the game until he just stopped playing.). give it some time to get updates and patches before you buy it.