The topic of Ayahuasca has come up here, so I thought I'd post
this.
There is a recent book out by Prof. Shanon about Ayahuasca,
entitled "The Antipodes of the Mind: Charting the Phenomenolgy
of the Ayahuasca Experience" (January 2003)
http://tinyurl.com/g5e8
Ok, I admit to knowing the guy

, so obviously I'm not
really objective about this, but for those interested in
the topic the book might be a good read.