Any psychonauts read Daniel Pinchbeck's Breaking Open the Head? Wonderful book. I'm not sure how crazy he might seem to other people, but to me a lot of his conclusions make a good deal of sense. While the evidence for psychedelics being more then just removed molecules and hallucinations more then only delusions is all mainly anecdotal, it is very convincing. Especially his story of the man who ate amanita muscaria and the guide in Gabon whose death was predicted under an iboga trip. 