The purpose of the Entheogen Project is to systematically gather knowledge about the immediate and long-term effects of entheogen use. Includes essays and an annotated list of topical books. http://www.csp.org/practices/entheogens/entheogens.html
Center of studies for ayahuasca, the sacred brew of Amazonian shamans. Includes information about the center, and their seminars and presenters. Located in Brazil. http://www.wasiwaska.org
Features information on the history and chemistry of this plant, and links to related sites. Also offers for sale peyote cacti. http://www.peyote51.com/