Although I'm guessing they would probably both have to be from the same class of weapon. So, two daggers/kunai/swords etc.
Why do you say that? It didn't really work in FFXI for a lot of jobs because you're so locked in by skill levels (like a NIN with katanas) but it was still possible.
I think wielding two different weapons is interesting and adds variety, especially in a game like FFXIV where it looks like it's going to give players a lot more freedom with how they choose to develop their skills, kind of like Mabinogi (and other earlier games with this system)
I know that in Aion you can wield a dagger/sword combo and in a few other games as well you can mix it up.
One of the coolest examples of dual wield I've ever seen in an MMO was Phantasy Star Universe where you could use a dagger or sword in one hand and a gun in the other.
(These are obviously completely skills but I think it might be a cool idea to allow that kind of variety.) Edited, Oct 7th 2009 11:03pm by Poubelle