Cedar Island (with 16 plots) and Port Spinoza (44 plots, two islands, but just getting going) are organizationally separate, though currently about half the members of Spinoza are transferred Cedar Islanders. Cedar is also beginning some re-development that will extend the number of plots. Things are looking bright for both communities.
My original assumption was that Spinoza would not choose to use consensus with all community members, but when it came down to it it was the form we were most comfortable with. Once you get used to the process, its fun to work thing out to everyone's satisfaction. Cedar has been using this approach for 16 months. Wikipedia has a description of the process:
http://en.wikipedia.org/wiki/Consensus_decision-making
Spinoza is increasingly doing much of its planning via wiki pages and then confirming the results at in-world meetings. That method seems to work really well. And in general, we don't rush decisions.
Some differences between Cedar, Spinoza, and CDS:
1. Both Cedar and Spinoza are communities of people involved in life-long learning. In order to be a member you have to have a learning project and there are requirements for giving quarterly presentations on your work.
2. Long-term membership requires at least three months and community approval. In practice this tends to be a self-selection process. We have never actually had to turn anyone down.
3. Administration is very minimalist. This is intentional, but it can be disconcerting if you expect more written rules and procedures.