We have already got a few members on our site, and we find it easier to maintain and administer with fewer members. Currently there are no games other than 4e, but one DM is willing to run a Shadowrun 4e, and also has plans for a generic 3.5 campaign if enough members join and are interested.

I'm the only one running Dark Sun, and I've been incorporating a lot of material from AD&D 2e Dark Sun into my game (Because 4e just doesn't have enough information to do it justice).