There are hundreds of websites devoted to green building. Many sites show how to insulate using different material, recommendations on how to heat and cool a new home, and everything else you need to know to build a new home.
The Best source I have ever found is Green Builder Magazine .The writers have extensive hands on experience and are very knowledgeable about works and doesn’t work.
Energy solutions for new homes
Energy efficient loans or mortgages (eem)
Energystar program is a government program to monitor and improve new homes.
Articles for builders and homeowners on building practices.
Extensive resource list of good building practices
American Institute of Architects
Architects guideline for green building.
How to design and build.
EnergyStar Tax Credits
Federal tax credits for energy efficiency: Energy star qualified homes.
Great site to understand reasons for using foam, and the different kinds of foam.
Website for National Association of Home Builders Bookstore.
Green Builder College