The International Seed Saving Institute
www.seedsave.org

The Organic Seed Alliance
http://www.seedalliance.org/index.php?page=Home

Seed Savers Exchange
http://www.seedsavers.org/ 

Primal Seeds: An important website for food security. Check out the books and links sections for inspiration.
http://www.primalseeds.org/

True Food Network: A shopping guide to non-GM foods
http://www.truefoodnow.org/shoppersguide/