Plot55.com  
   Provides information on the cultivation, preperation and use of entheogenic, hallucinogenic and psychoactive plants.
   http://www.plot55.com

Wasiwaska  
   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

Council on Spiritual Practices - Entheogens  
   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

The Mad Hatter  
   Guide to entheogen use; includes essays and information on drug laws and suppliers.
   http://www.clearwhitelight.org/hatter/

A Brief History of Peyote  
   The divine cactus in historical context.
   http://www.peyote.org/

Entheogen Dot  
   Online community, and an information resource with a focus on shamanic plants.
   http://www.entheogen.com/

Peyote51  
   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/

The Copelandia Community  
   International entheogen-based community and church focusing on experiential spirituality.
   http://www.copelandia.org/