The ship idea would be the best one yet.

Only problems that need to be solved is how to have enough renewable energy to sustainable propulsion and other things.

Or we can do some research and build a city at the bottom of the ocean, and we can call it..... RAPTURE.

Maybe a currency doesn't need a nation, or anything. Bitcoin was started on the internet, so it will inspire from the internet. Bitcoin needs to go viral. The problem is that its so difficult to the layman to understand. I got casascius physical coins delivered to my grandparents house, and they said: "Vat iz this?" and I went: "Bitcoins" and they pulled confused faces and went: "What is a bitcoin?" And there I sighed at the futility of explaining to technophobic grandparents what bitcoin was and how it worked. So I settled for: "It's a currency." Next question was: "Who uses it?" Stumped...

It's people who offer goods and services who help out the bitcoin world.

At the moment, the hysteria is coming from people noticing Bitcoin is a good investment, but this is good because more people become aware, so more people willing to sell goods and services for it. Speculation is the nessecary growing pains, even people who accept bitcoin, but charge their equivilant in local currency. Eventually things will be nice and stable and there will be no need to have these exchange rates, then the bitcoin world will blossom!

But the kid in me would prefer a floating city, or an underwater city. NAY! A submarine city!!!