1. Age of Conan(http://www.ageofconan.com) - Age of Conan is getting better after several updates, specially the big one in last month, introducing new land area, a new dungeon, new quests and hours of more adventure. Also, as far as crashes are concered, the last few patches addressed most, if not all, of the causes. The game runs great now; however, there is the occasional lag spike.
2. Atlantica Online(http://atlantica.ndoorsgames.com/) - The only free-to-play, turn-based MMORPG with 3d graphics. Great game play, a great market system, guilds, nations, guild dungeons, nation dungeons, shadow dungeons, PvP, PvM, crafting, and many characters to choose from, though a bit unbalance between classes.
3. chronicles of spellborn(http://www.tcos.com/) - A very new and original MMORPG which is on CBT now. Outstanding graphcis, flexible character customization, manual-targeting combat(isn't like other mmorpgs that are click, click, attack.), really creatively-designed dungeons and maps, cool and big city, quests thoughtfully designed to go with the storyline and so on. All of these deserve a try.
4. Warhammer Online(http://www.warhammeronline.com) - WoW may be better in other ways but WAR is more social and has better PvP. The PvE and RvR elements are well done IMO, theres is a strong story behind the quests that draws from Warhammers mass of lore and history and really immerses you in the Warhammer univers, like an integral part of the game. Besides, the open party thing makes it easy for casual grouping/ungrouping before you can get that group quest done!