Several folks have commented recently about ocean-going libertarian havens, supertankers used as data havens, and so forth. Some have speculated that Russia itself is a candidate, given that it has little vested in the previous system and may be willing to abandon statism. The basic problem is that physical space is too small, too exposed to the view of others. Piracy will be just one of the problems. Cyberspace looks more promising.
Interested readers have many sources.
Alice and Bob, our favorite cryptographic stand-ins, can communicate and transact business without ever meeting or even knowing who the other is. This can be extended to create virtual communities subject only to rules they themselves reach agreement on, much like this very Extropians list. Private law is the only law, as there is no appeal to some higher authority like the Pope or police. This allows for rapid experimentation, self-selection, and evolution. If folks get tired of some virtual community, they can leave.