2. General: An introduction and overview of residential solar energy, "Building America Best Practices Series for High-Performance Technologies: Solar Thermal & Photovoltaic Systems", is available at the US Department of Energy's Building America site. The article is from 2007, so some information may be out of date.
3. General: The National Renewable Energy Laboratory website is a great source of information about the latest developments in solar power technology.
4. General: Find a Certified Solar Roofing Professional (CSRP) at the website of Roof Integrated Solar Energy (RISE), which is an organization "created to provide a means of evaluating and certifying solar roofing professionals to support the widespread use of rooftop solar energy".
5. General: Mapdwell has a free and easy-to-use interactive tool which allows visitors to their site to get a detailed assessment of the solar energy potential for any building within the areas they've mapped. Currently only available for a few cities, including Boston and Washington, DC; their database is expanding.
6. Financial: "The Solar Investment Tax Credit": see this for an explanation of the US federal tax credit granted for solar energy installations. Made available by the Solar Energy Industries Association on their website.
7. Financial: State tax credits and other incentives and policies can be seen by going to the DSIRE (Database of State Incentives for Renewables & Efficiency) website, which is funded by the US Department of Energy and operated by the North Carolina Clean Energy Technology Center.
9. Technical: "Photovoltaic Systems and Asphalt Shingle Roofs" has some very basic information. Available at the Canadian Asphalt Shingle Manufacturers' Association website.
10. Technical: See this Product Data Sheet for the technical characteristics of photovoltaic panels at the Kyocera Solar website. This is only an example and other products and brands may be different.