Information on Buddhism and Psychedelics from hopkinsmeditation.com, presumably associated with the Johns Hopkins psilocybin research.
A list of links to various Buddhists (Jack Kornfield, Tara Brach, etc.) and Buddhist-friendly psychonauts talking about the intersection of psychedelics and spirituality. I think my favorite was the long piece by Myron Stolaroff, "Are psychedelics useful in the practice of Buddhism?" Stolaroff also wrote "The Secret Chief Revealed" which I linked to at the end of the post on Psychedelic Trip Guides. I keep meaning to do a trip guide myself, I think I'd better do it before I get too far away from it.