MMO's to play with windows+buntu

My comp has windows and my brother's Ubuntu. Are there any MMO's we could play together?

I don't know the answer. You could check out the (old) discussion in this thread: http://ubuntuforums.org/showthread.php?t=1912709

They link a game or two.

Likely the ideal solution would be for your brother to find Windows-oriented MMO games that run well with Wine