We love both green building, open source design and open source architecture, so the new 10 House caught our eye. It's an effort to construct a wiki laying out the design principles and techniques which would enable bright green house to be built for ten thousand dollars:

This project codenamed "10 House" (10K for a perfect 10 house, aka the "wiki house") will be a repository of information, methods, and materials to build a green house for approx. $10,000. Can it be done? The goal is to find out. After we've hammered out the costs on paper the next step would be to have one built!