EnergyTaxIncentives.org: a guide to finding tax incentives for building green
16 Easy Ways to Green Your Home by the U.S. Green Building Council
Home Energy Saver by Lawrence Berkeley National Laboratory
A Consumer's Guide to Greening Your Home by the U.S. Department of Energy
Building Design Advisor by Lawrence Berkeley National Laboratory
Home Energy Efficient Design (HEED) by Murray Milne/UCLA
Energy Star Target Finder by Energy Star/US EPA
Building Energy Software Tools Directory by U.S. Department of Energy

The White House's Agenda for Energy & the Environment
US Green Building Council (USGBC)
Architecture 2030
Whole Building Design Guide
AIA Committee on the Environment (COTE)
GlobalGreen (American division of GCI)
American Solar Energy Society (ASES)
Sustainable Buildings Industry Council
Architects/Designers/Planners for Social Responsibility (ADPSR)
Association for the Advancement of Sustainability in Higher Education

MyFootprint.org: Calculate your ecological footprint
Build Carbon Neutral: Estimate the embodied carbon of a building
Consumer Consequences: A game to find out if you are consuming sustainably
Global Warming Footprint: An estimator provided by the US Senate
Zerofootprint.net: a "One Minute Calculator"
Planet Green Game: A game that teaches you about reducing carbon emissions

Intergovernmental Panel on Climate Change (IPCC)
Natural Resources Defense Council
World Wildlife Federation (WWF)
The Sierra Club
Rocky Mountain Institute
Green Cross International (GCI)
United Nations Environment Programme
Smart Growth Network
The Earth Charter Initiative
Environmental Defense Fund

TreeHugger
Inhabitat
Huffington Post Green
Yahoo! Green
Dot Earth
Green, Inc.
FabPreFab
EcoGeek
World Changing
Jetson Green
WebEcoist

Google Transit: Plan a trip using public transportation
Calories Burned Calculator: Calculate how many calories you burn walking, biking, etc.
Gmaps Pedometer: Calculate how far you walk
USA National Gas Temperature Map: Compare gas prices around the country
HybridCars.com: Auto Alternatives for the 21st Century
AutoBlogGreen: Blog about fuel-efficient cars
ZipCar: ZipCar car sharing system
Connect by Hertz: Hertz's car sharing system
BioDiesel.org: Official site of the National Biodiesel Board
FillUp4Free.com: Network of Waste Vegetable Oil (WVO) filling stations
GoldenFuelSystems.com: Convert your diesel vehicle to accept biofuel

Env Design + Construction Magazine
GreenGuard rating system
Sundance Channel: The Green
HGTVPro.com: Green Building
High Performance Buildings Magazine
The Green Office
Green @ Work Magazine
Journal of Green Building
Scientific Certification Systems

Archinect
Architecture for Humanity
Open Architecture Network
Design Can Change
SuperUse.org
Farr Associates
Windmill Developments