Though not so 'user friendly' as the dancesafe site, Erowid has much to offer in providing information about a drug - with a LOT more detail. Perhaps too 'medically comprehensive' for the average Joe, Erowid is nevertheless a good link to save to your favorites when needing more details on the 'Psychoactive Community' and the various drugs favored within. Not only are particular drugs and their effects described in detail but also included is the history of use, the current medical research, various shamanistic/spiritual perspectives, and current judicial policies/implications regarding use. There are pages and pages of information regarding persons of influence in the Psychoactive Community and various photo albums to various artists' work and major events such as Burning Man.

DaddyT says save this site for those coming down after days when your head is blown and you are wired up tight with nothing else to do but get better informed for the next round...