For the record, our COD4 server is up 24/7 now.
Also Counter Strike Source if anyone is into that.
We are still having a few snags with Unreal Tournament III since moving to the new server near Seattle, but soon it should also be up 24/7.
If looking for a fast server to play COD4 on though, give it a try.
2.4 GHz Quad Core, 2 GB of RAM, and Windows Server 2003.
These are our three games running below, and the banners update often.
IP is in the banner to join.
I do not have COD4 yet, but may pick it up in the future.