Disney launched Pirates of the Caribbean Online last October as a free massively-multiplayer game in the vein of Everquest, but with Pirates. Here's their synopsis:

Set sail on the vast blue waters of the Caribbean in search of adventure, fortune, and fame in the world of the infamous Jack Sparrow and the evil Davy Jones. Create and customize your own pirate, build and outfit your own ship, and assemble a crew of your fellow rogues. Set your own course, your own adventure, and truly live the Legend!

It's totally free to sign up and play but there are ads and certain limits on what you can do within the game world. If you get really into it, you can pay to unlock everything and remove the ads. Reviews of the game are lukewarm, but hey, it's free and works on a Mac too, so maybe if you need a diversion...

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