Well, I'd be more than happy to join a CoD4 team when I eventually get a new PC, or this one back to a better working condition. If you want some past experience, I used to play for discrimin8 before they disbanded (3rd in Europe on ClanBase, SnD 5v5).

Personally, even when Black Ops is released, I think CoD4 will still stay at a competitive level, and MW2 will still suck ass for competitiveness.