National Alliance for the Mentally Ill (NAMI)
"NAMI is a nonprofit, grassroots, self-help, support and advocacy organization of consumers, families, and friends of people with severe mental illnesses, such as schizophrenia, major depression, bipolar disorder, obsessive-compulsive disorder, and anxiety disorders." This site has book reviews, informational fact sheets on various mental illnesses and treatments, position papers, and more.