hmmmm let me see.
Sword of the new world- Ive been with this game through the beta. They tried to sell a monthly subscription for it for about 4 months, setting a level cap at 20 for non-payers but that fell on its face when only about 100 people signed up for it. Its free now and is amazing. Its party based with an amazing AI system that basically does all the fighting for you. the game takes up a HUGE ammount of ram to run though. if you dont want to wait 10 minutes for each level to load, i's say at least 2 gigs of ram, i have that now and it loads in about 20 seconds. the only problem with it now is that there are TONS of bots. this can cause lag if there are alot of monsters around. the game also has the best soundtrack ive ever heard in a game.
Atlantica- party based, turn style, mmorpg. this is a fun game but sometimes it grinds on. I'm not very far in it yet.
Fiesta- a very fun if a tad off game. If you can get over some of the weirder bits at the low levels, you get into some simple amazing equipment and fun quests at the higher levels
Requiem - very gory but deep in quests and story. kinda new with not many players.
Dekaron- personal favorite but not many players as of yet. great everything
Silkroad- good but once you get to level 12 or so and you have to kill 100 tigres for your quest, it gets old. fast
Runes of Magic- i havnt put much time into it yet as it looked horrible in the first 10 mins of play but the video on youtube for it looks amazing so i may start leveling soon. it just entered open beta on 12/12/08 so its still developing, i hope its better later in the game.
One to look out for that may be coming out soon is Mabinogi:Heroes. Its totally different from the game's predecessor, Mabinogi which was HORRIBLE beyond comparison. Heroes looks amazing, just look it up on youtube.