Try this: http://apolyton.net/forumdisplay.php/101-AC-Multiplaying?s
Fairly active SMAX community.
I'd be up for a multi-player game, but there are a few game rules I'm still trying to iron out, specifically the effects of resource intake on ECONOMY, LABS and PSI. I'm also unclear about the role of talents, specialists, and other aspects of population management. Everything else is falling into place though.
I'd have to say this is one of the most engrossing games I've ever played.