For general questions about the benefits of solar energy, the websites listed below offer a complete overview on the subject.
The Database of State Incentives for Renewables and Efficiency provides a searchable comprehensive database of state, local and utility based incentives.
Solar Energy Industries Association works to expand the use of solar technologies, strengthen research and development, remove market barriers and improve education and outreach for solar.
Solar Rating and Certification Corporation administers a certification, rating and labelling program for solar collectors and a similar program for complete solar water heating systems.
The National Renewable Energy Laboratory provides information on installing a solar hot water heating system in your home and solar radiation maps.
Solar Energy International
Solar Energy International is a resource for education and training programs.