Good games to multi-log?

I'm poor. I've dual-logged WoW quite a bit in the past and I've recently decided to give keyclone a try. Does anyone know of any good, old (read: cheap) games that are good for multi-logging? I mostly want to goof around with keyclone for a while with some other games. I'd love to 5-log WoW, but I unfortunately don't have the funds to do so.

Apparently Anarchy Online is fairly easy to multi-box (my brother does it) and best of all its absolutely free. You can make as many accounts as you want - i think that 6 is the maximum for a group on Anarchy online as to 5 on world of warcraft.

Wow... the game was so shitty they finally made it free? I remember when it was in BETA it was terrible.