http://seiv.pbw.cc/
Play By Web.. MUCH preferable to PBEM, in my opinion. Works essentially the same way, except the PBW server does all the hosting work, allows people to take over easily for dropped empires, automaticlly sends out the turn notices, and can automaticlly run turns every 24/48/whatever hours, or when the Last player uploads their turn.
Great system.
Phoenix-D