A few months old, but of possible interest. (I haven't watched it yet myself.)
http://www.ted.com/talks/marcin_jakubowski.html ABOUT THIS TALK Using wikis and digital fabrication tools, TED Fellow Marcin Jakubowski is open-sourcing the blueprints for 50 farm machines, allowing anyone to build their own tractor or harvester from scratch. And that's only the first step in a project to write an instruction set for an entire self-sustaining village (starting cost: $10,000).
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