Other
U.s. Department of Energy: Photovoltaics
This site has an overview of PV technology, impact, system application and design. Information is provided on how to select the best solar system for various needs.
US Energy Information Administration
U.s. Eia: Energy Kids: Renewable Energy: Solar
This is a resource on solar energy, photovoltaic energy, solar thermal heat, solar thermal power plants and other forms of energy.