http://hotair.com/archives/2011/08/16/are-you-ready-for-floating-libertarian-city-states/
An interesting idea, though I'm not sure if it could happen in the current political climate in the world. I think, right now, there would be too many issues of citizenship and recognition of independence for city-states to be a feasible option, but it would be worth at least experimenting with, I think.
It's hard to argue with that!
3 hours ago