What pen-and-paper RPG would make a great MMO?

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This weekend thousands of gamers and geeks are descending on Indianapolis for GenCon Indy. Over four days, countless board, card, LARP and RPG games will be played, merchandise purchased in mass quantities, and new friendships formed.

GenCon's always been a good reminder that we MMO fans have roots in a much larger community of gamers, and that our interests often converge in unexpected ways. For all of the MMOs we have, there are even more pen-and-paper roleplaying games out there, some of which might just make a good online game if put into the right hands.

So how about it? What tabletop RPG would make a good MMO -- and for kicks, what studio would you want handling it?

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