Erik Davis has had a lot of very interesting podcasts recently on his show, Expanding Mind. I recently enjoyed listening to the Mark Pesce and RU Sirius interviews as well as the one with Richard Doyle, professor of (science &) Rhetoric at Penn State and Berkely and author of On Beyond Living, Wetwares and soon to be published The Ecodelic Hypothesis: Plants, Rhetoric and the Evolution of The Noösphere.

http://davis.progressiveradionetwork.org/