Consumer Energy Center: Cool Roofs - http://www.consumerenergycenter.org/coolroof
A collection of resources on cool roofs, which use reflective materials that stay up to 60 degrees cooler than traditional dark-colored roofs. These roofs reduce energy costs, increase the lifecycle of the roof and contribute to the reduction of associated smog. This site is from the California Energy Commission.
The Cool Colors Project - http://coolcolors.lbl.gov
This site features background materials and progress reports from a research project aimed at developing "cool" roofing materials that will reduce the roof temperature of buildings and increase energy efficiency. The site includes publications and presentations and is the result of a collaborative effort between Lawrence Berkeley National Laboratory and Oak Ridge National Laboratory.