Graham Hancock has posted a short documentary (25 mins) regarding the ayahuasca experience to his YouTube account which is well worth a look. Created by by Alexander G. Ward as a testimonial to his own shamanic trip at the Tierra Vida Ayahuasca retreat in Pucallpa, Peru, it acts as a decent primer on the topic, giving an introduction to the ayahuasca brew, the process of its creation, footage of an actual ayahuasca ceremony and and a detailed account of the psychedelic experience:
On a related note, Graham has also recently posted another video interview by Sonia Doubell, this time with anthropologist/ayahuasca researcher Luis Eduardo Luna.