I don't do much online gaming anymore, because my machine is starting to show its age.
When I do get around to playing online, it's usually BF2, TF2, the occasional Counter-Strike game, or Half-Life 1 Deathmatch (which no one really plays anymore).
In all cases, my nick is "Shugah Bear". It's a long story involving my favorite breakfast cereal as a kid. Don't ask.