Energy Guide: Great tool to help homeowners identify efficiency problems in their home.

Energy Savers: Part of the DOE website including glossary, fact sheets, and tips for several home systems and appliances.

Global Green: Non-profit that partners with housing developers and public agencies to 'green' select affordable housing projects.

Build It Green: Non-profit organization whose mission is to promote healthy, energy- and resource-efficient buidling practices in California.

American Solar Energy Society: Non-profit leading the solar energy revolution.  Find jobs, solar providers, national news.  Offering an array of conferences, educational resources, home tours, and more. 

Sustainable Business: Connecting job seekers and employers in the green sector.  Provides global news and networking for businesses to flourish.  Offers products and services that fulfill society's needs while contributing to the well-being of all earth's inhabitants.

GreenSource: A team with architecture and engineering experience from BuildingGreen, Inc., Architectural Record, and McGraw-Hill Construction who collaborate to publish GreenSource Magazine.

McGraw-Hill Construction: This company connects people, projects, and products across the design and construction industry.

US Green Building Council A non-profit trade organization that promotes sustainability in how buildings are designed, built and operated.  The USGBC is best known for the development of the Leadership in Energy and Environmental Design (LEED) rating system and Greenbuild, a green building conference that promotes the green building industry, including environmentally responsible materials, sustainable architecture techniques, and public policy.

Green Building: US EPA This federal agency is responsible for protecting human health and safeguarding the environment.  Their Green Building page answers any questions, offers quality information, and statistics on the benefits of green buidling.

Sustainability: US EPA The sustainability program of the EPA's office offers a one-stop access to research and activities related to urban sustainability and the built environment; water and ecosystems services; energy, biofuel, and climate change; and materials management and human health.

US Deparment of Energy Their overarching mission is to advance the national, economic, and energy security of the United States; to promote scientific and technological innovation in support of that mission.

Energy Star An international standard for energy efficient consumer products.

Dow Jones Sustainability Indexes The first global indexes tracking the financial performance of the leading sustainability-driven companies worldwide.