Quick Resource: http://wrrc.arizona.edu/sites/wrrc.arizona.edu/files/Quick%20Resouce-%20UHI%20%28final%29.pdf
Other resources:
U.S. EPA's compendium of strategies to reduce urban heat islands. http://www.epa.gov/hiri/resources/compendium.htm
Basic information about urban heat islands http://www.urbanheatislands.com/