http://www.builditsolar.com/Projects/SolarHomes/plansps.htm. There's so many resources on this site it's a little mind-boggling.
I struggle with this overwhelming feeling of responsibility, that it's my duty to save the world. This is an unproductive thought: trying to figure out how to best influence the world is a truly paralyzing endeavor. It's best to find something I enjoy and just go with it. The problem is that I enjoy so many areas, mostly because they all have to do with sustainability.