I was just thinking to myself today that, as far as I am aware, no-one has yet tried to create an RPG, MMO or otherwise, based upon a pirate theme. It just occurred to me that such might prove a successful idea with the only problem I could think of being the lack of an otherworldly bestiary, and otherwordly characters. Still, what with the high soceity, low society, pirates, navies, privateers, jungles, forts, cities, treasures, and whatever else you can think of, I think it could work.
The only other thought which came to me, was a Monkey Island RPG.
Any other ideas?