One I played for awhile back in it's infancy is Imperian Conflict at
http://www.imperialconflict.com but I have not even checked the website for at least a year, it was good fun, it's a turn based strategy where every hour is a turn, like the game Utopia and, er, the more spacier utopia that I can't remember the name of. Might want to see if you like Utopia too at
http://games.swirve.com/utopia/
..Oh, and then there's archmage at
http://www.magewar.com/ which is fun but tends to fade pretty quickly. It's hour-based strategy as well, but a little different.
See if you like any of those, last I checked they were free (minus the optional premiums accounts and that kind of bull)