I play almost nightly with people who are the relics of a long-defunct message board (as am I). The board was run by Chet Faliszek, now at Valve, beginning in '99 and lasted more than a decade, so most of us have known each other (in the online sense) since Clinton was President but are pretty good friends anyway. There are plenty of newcomers, too, but they're all cool. I'd guess there are about forty of us. (Just got out of a Versus game before tooling in here.) One of the hive runs an Official Steam Server™ (I think he pays about $40 a month or so) -- it's public, but allchat is always on at Alienjack's Treehouse of Cockrub and you gotta be able to keep up with the jokes while killing like a true champion. No one else need apply.
Also, I've been (depending on how you look at it) either a) fiddling around making geometry, textures, and experimenting with zombie gymnastics, or b) making a campaign the likes of which have not been seen before, which is probably a good thing. I adapted my fractal landscape generator to import terrain into Source, and it works pretty well. If this silly video ever finishes uploading to WhoTube (15 minutes remaining, except it'll probably crash first) I'll post a video of a geometry test for one level. The nav mesh is not polished in the slightest, it has a hard time spawning hordes because everything's visible, pathfinding is a joke, its's way overstocked on weapons, etc., etc., and YES I KNOW. Bbut that wasn't the point. The point was my fairly groovy-looking cave, or more precisely "inside-out mountain". (Also seeing how well my shacks worked. Answer: ok, sort of.)
Oho, YouTube says it's loaded. That means you have to wait another hour. This is the only video I had that fit on one monitor, but nothing else was that interesting, either.
BUT ANYWAY -- Yeah, there are people here that still play L4D2. Friend me on Steam (Repomancer) and if you don't fill me with disgust, come join a game. Everyone's pretty good but we're just in it for the fun.