The book Solar Energy Systems Design is offered in a newly revised and free version on this Web site. It is an excellent resource to learn about solar power and the technology that is used to harness it. Seven chapters describe how the sun itself produces energy, how the sun's position relative to the earth's surface effects energy system generation, and how various collectors work. In addition to the text, there is an overview of the J.T. Lyle Center for Regenerative Studies, an institution that envisions a society only dependent on renewable forms of energy. Unfortunately, not all of the Web site's features are available, such as two calculators and a section of problem sets.