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.
Other
Sun Wind Solar Industries, Inc.
Solar energy facts and information. Instructions on how to build solar devices.
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.
NASA
Nasa: Helios, the Solar Powered High Flyer
This site is an article on, "Helios can fly higher than any other airplane! And it uses only the Sun's energy for fuel!"