Gunbound isn't a MMORPG, Enix. -_-;
City of Heroes is good, but gets boring FAST.
Ragnarok Online is fun for awhile, but so many people have their computers (botting) play for them, that it's pointless.
Anarchy Online.. I haven't played since the expansion, but I played the original, and it was laggy, full of bugs, terrible AI, and a boring universe. Maybe it's changed.
EVE Online.. a very impressive MMORPG, that's way too in-depth and detailed for the average gamer. If you like sci-fi, and you like reading, you'd probably really enjoy this game. This game shows the true 'loneliness' of space--not that there aren't many people playing it, but space is gigantic and your chances of running into people is rather low, even if you join organizations.
World of Warcraft.. Meh, I played in the beta. It's okay.. It's laggy, also full of bugs, but it's still in the Beta stage, so they might get them worked out. Although it seems like "just another MMORPG/EQ clone."
Guild Wars is an upcoming MMORPG that looks pretty good--skill based fighting, instead of level based characters, with an emphasis on team tactics. (This is made by ArenaNet, and some of the lead developers formerly worked for Blizzard, 2 making WC3 and 2 making Diablo2, I believe.)
Dark Age of Camelot/Asheron's Call.. I wouldn't really try these in a million years. Everybody I've ever talked to about these says they're garbage EQ clones.
Pristontale is a.. interesting.. attempt to make a MMORPG that's like a combination of Diablo2, and Ragnarok Online. It was very laggy when I played, and believe it or not, the playerbase is TOO international. MANY people have absolutely -no- knowledge of English, which makes finding groups/etc sort of difficult.
Horizons.. I tried this game a few months ago. Good graphics, VERY interesting story, but sort of laggy, and it ran with bad FPS (Even though I'm on a dual GHz p4, and a 9800XT.. People say that ATI cards don't run well on this game,) also the game is nearly dead, playerwise. The company who made it filed for bankruptcy (I wonder why..) but the game is still being hosted. The world is almost empty, and there are only about 200 people on each server.
Final Fantasy XI. An interesting game, with a semi-interesting 'story.'
This game emphasizes group-play over anything else, and even if you want to be a craftsman, you have to hunt anyway in order to get enough gil to make things/crystals to produce things. There's not much to do in this game besides hunt/do quests, and the Japanese population in the game isn't overly friendly to people who don't speak Japanese, which makes grouping at higher levels more and more difficult. (as it's been out longer in Japan.) Also, FFXI gets very boring when you get tired of seeing the same enemies over and over, with different names and stats, instead of making more monsters.
Anyway.. Hope this helped somebody.