Apolyton Gathering is the name of a PTBS (persistent turnbased server) game. It is already full of players. (PTBS games are played at the turn rate of one turn per day, or thereabouts, over a year or more.)
If you're interested in a PTBS, head to the PBEM forum (Where PTBS was born, essentially). If you're interested in a 'fast paced' MP game (over in three to six hours), stay here, and head to one of the threads on it - either Rah's Saturday game, or the Aussie game, or I think a couple others.
There is also Diplogames, which is a sort of role playing ish live MP game that takes place in 'fast' speed, ie turns every few minutes, but takes a few months because they play in sessions once per week, and roleplay a lot which makes turns take longer (And play epic speed etc.) Those threads are also in this forum.