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I've put together playlists of several interviews with Graham Hancock about his book Supernatural. All threee interviews are excellent and informative. In them, he shares his experiences with the use of ayahuasca and other psychotropes, under the care of traditional shamans and other healers. He also explains his belief that shamanic, altered consciousness experiences underpin all the world's great religions and advocates that individuals have the freedom and encouragement to experience the boundaries of consciousness and explore the spirit world for ourselves.
The final interview with Conscious Media Network is also available for viewing in their free archive. It's the shortest of the interviews at just under a half hour.