The following websites are good resources for info on these and other substances.
erowid.org
tripproject.ca
dancesafe.org
Drug Info and Harm Reduction
Erowid.org
http://www.erowid.org
Erowid.org is an online library of information about psychoactive plants and chemicals and related topics. The information on the site is a compilation of the experiences, words, and efforts of hundreds of individuals including users, parents, health professionals, doctors, therapists, chemists, researchers, teachers, and lawyers. Erowid acts as a publisher of new information as well as a library for the collection of documents published elsewhere. The information found on the site spans the spectrum from solid peer reviewed research to fanciful creative writing.
TRIP!
http://www.tripproject.ca
This website was created by and for partyers in Toronto's electronic music communities. The information on this site is based on a true harm reduction approach, meaning that as we work to minimize harms among those in our communities, we neither judge nor discriminate against people's drug use or sexual activities -- we are here to provide information and resources to those who choose to be safer in their partying. If you're not down with our approach, then this site may not be for you!
DanceSafe
http://www.dancesafe.org
DanceSafe is a US based, nonprofit, harm reduction organization promoting health and safety within the rave and nightclub community. They currently have local chapters in twenty-six cities throughout the US. Their trained volunteers staff harm reduction booths at raves, nightclubs and other dance events where they provide information on drugs, safer sex, and other health and safety issues concerning the electronic dance community (like driving home safely and protecting one's hearing). They also provide adulterant screening or pill testing services for ecstasy users. Pill testing is an important harm reduction service that saves lives and reduces medical emergencies by helping ecstasy users avoid fake and adulterated tablets that often contain substances far more dangerous than real ecstasy.