Can the color of my roof save energy?

Here's the answer straight from those who know:

http://www.newton.dep.anl.gov/askasci/eng99/eng99323.htm
http://www.energy.ca.gov/title24/coolroofs/
http://www.energystar.gov/ia/partners/product_specs/program_reqs/roofs_prog_req.pdf
http://www1.eere.energy.gov/buildings/pdfs/cool_roof_fact_sheet.pdf