For me the challenge is that right now my wonderlust and comitments require me to travel extensively, so I can't be a part of such a community for very long.
Having reviewed my options I arrived at two. Either organize something caravan style (perhaps on a boat, since it is somewhat easier). Or seed and spend time building several such communities in different parts of the world, and then travel between them. Perhaps spending time as part of existing communities in places where they exist. Where my friends moved seems like a good such place to start.
Anyhow, that is my plan for forseeable future!
I would love to see floating towns of people voluntarily living together, out in the water free from any nation's rules. They could structure whatever type of community system they wanted. If one wanted full-out communism, they could have it. If another wanted a floating Galt's Gulch, they could have that.
They could all freely trade with each other and with people on the mainlands.
The only three problems would be
The first two could be countered with technology and ingenuity. Perhaps have eco-domes that you can close up, strap yourself into, and ride it out. Even if things get tossed around, you'll bob back up afterwards and keep chugging along.
The pirates, though...without your own formidable navy, you're sitting ducks.