Tons of info on a plethora of materials. Remember to verify what you read before acting upon it (not that I'd endorse acting upon it, mind you), though -- this stuff comes from usenet postings, not always the most accurate source.
Hosted by the invaluable Lycaeum, this site should tell you everything you need to know about the "vine of the soul" and the tryptamine-rich admixture plants that combine into the potent brew named in it's title.
Read this and snicker no more when you hear about "robo"; apparently it's quite a powerful dissociative, capable at sufficient doses of inducing Ketamine-like mental states! Thorough, clear and incredibly well-researched, with a very valuable section on receptor function and neuropharmacology.
Home of Briton Nicholas Saunders, author of E for Ecstasy and the new Ecstasy and the Dance Culture. Hypertext articles, all of E for Ecstasy, and important info on purity and safe use.
A plethora of useful tidbits for mycophiles of all kinds. Features a breathtaking photo gallery of luscious psilocybes.
A good collection of useful information on the world's most popular empathogen. Features a FAQ, synthesis info, health risks, and material on other popular club-scene drugs.
This part of Dimitri's domain is the best collection of DMT related material I've found yet on the web.
Contains several clinical articles on treatment of drug addiction with Africa's native entheogen.
All the important information on the psychotropic shrub of the Pacific.
How to use nitrous with relative safety and effectiveness.
This section of James Kent's Lux Illuminati site is an extremely well-written, illuminating presentation on the Dom Perignon of dissociatives.
The Grateful Dead lyricist corresponds with Terence about the revelations of the DMT flash.
This section of Timewave Zero software programmer Peter Meyer's Serendipity site is an informative compendium of mushroom and DMT related material.
A treasure-trove of information on the entheogenic Mexican mint, complied by the discoverer of the psychoactive effects of salvinorin-a, its active principle.
An abundance of essential information about sacramental cacti of all types.
This part of the herbweb website is a very creatively rendered multimedia "book" in hypertext on the subject of mushrooms, ayahuasca, and DMT.