American Architectural Manufacturers Association
www.aamanet.org

Commercial Windows Initiative
www.commercialwindowsinitiative.org

Door & Window Maker Magazine
www.usglassmag.com

Glass Association of North America/NGA
www.glassfacts.com

National Glass Association
www.glass.org

Window & Door Magazine
www.windowanddoor.net

Window and Door Manufacturers Association
www.wdma.com

Primary Glass Manufacturers Council
www.glasswebsite.com

Efficient Windows Collaborative, a project of the Alliance to Save Energy
www.efficientwindows.org

Florida Solar Energy Center
www.fsec.ucf.edu

Window & Door R&D
http://www.eere.energy.gov/buildings/tech/windows.html

Fenestration Information
http://www.eere.energy.gov/buildings/info/components/envelope/fenestration.html

R&D Forum
http://www.govforums.org/e&w/

The US DOE/EPA's ENERGY STAR program.
www.energystar.gov

Lawrence Berkeley National Laboratory
windows.lbl.gov

Oak Ridge National Laboratory-Building Science
http://www.ornl.gov/sci/roofs+walls/tour/index.html