I visited Vienna's Metalab in July 2007, back when I didn't really know what hackerspaces were, but instantly grasped the idea. In fact, as I learned more I was surprised to find out that it hadn't started sooner. Today, they're all over the world, and you can find your nearest one on hackerspaces.org. They offer workshops and classes on everything from Arduino to welding to bookbinding, as well as a space to congregate and tinker. Some act as areas for freelancers to have a sort of office, and they work without an undue amount of centralized authority.
I also believe, though, that every system of behavior rests on a ground of culture. Seemingly 'free' systems, from classless hunter-gatherer groups to modern anarchistic communes, if they are to work, need to have strong cultural norms to prevent antisocial behavior. I'm curious, then: what is the ideal culture of a hackerspace?