http://www.solarbuzz.com
An extremely informative site built by an international solar energy research and consulting company. The site has regularly updated news on who's doing what in solar power, as well as international and domestic price surveys, technical information, and historical pricing data.


http://www.nrel.gov/solar
The National Renewable Energy Laboratory's website has regular updates on solar energy research and government-subsidized solar installations.


http://www.eere.energy.gov/solar/csp.html
The Department of Energy's Energy Efficiency and Renewable Energy website. This program covers many alternate energy sources and strategies. The link above is the part of the site devoted to solar.


http://www.sandia.gov/pv/main.html
Sandia National Laboratory has an active solar power research program. This page provides an overview.


http://www.solarelectricpower.org
A site maintained by a consortium of utilities, energy-service providers, and the PV industry.


http://www.howstuffworks.com/solar-cell.htm


http://www.solarpower.com