Deicide Online: Looks cool, but i aint tried it out yet. has this kind of castlevania look. you know gothic, and not in the fashion style but gothic in the tense of the medievil church.
http://www.deicideonline.net/
Regnum: it's pretty cool, has what's apparently called Realm vs Realm, kinda like Dark age of Camelot if you ever played that.
http://www.regnumonline.com.ar/index.php?l=1&sec=0
RealmWars: i haven't played it yet, but looks cool from the screenshots, it's basically player versus player, where it's all about sieging castles and shit.
http://www.realmwarsgame.com/info/index.shtml
Age of Armor: Haven't played it, but looks like Gundam wing or some shit, basically pilots in these big ass robots that have these big ass guns flying around in space having big ass fights.
http://www.aoaus.com/