I like the whole idea of playing FFXI online. Since they're coming out with FFX-2 and FFXII already anyhow, it doesn't seem harmful that they are making one of them online. Plus, I find the aspect of being able to play with a team very interesting. My room-mate and I are both going to play at the same time, since we usually have to watch each other play FFX, and kick some serious [censored]!
What we're going to do is buy one PS2 version and one PC version, and just play off the same Cable internet connection. Though, I'm going to try out the PC version on a friend's computer first, so that I don't go buying two copies of the game and thinking it's not worth the time.