FFXI is definitely a great great game. I miss it a lot and played it quite a bit, the only reason I returned to WoW is because of friends.

I was doing very very well tripleboxing in this game and it even allows you to play melee classes with a breeze!
If your bored of WoW and need another good dualboxing game, this is it. Although be warned on how long it takes to level. It's no joke ;p