My online mini-book Facing the Singularity now has a podcast. Ratings and reviews on iTunes will be much appreciated, so as to direct people toward a rationality-informed approach to intelligence explosion.
Jaan Tallinn has been passing my chapters around to people because they are concise explanations of key lemmas in the standard arguments on the need for Friendly AI. This is gratifying because it's exactly the purpose for which I'm writing them, and I encourage others to send people to these chapters as well.
(I'm currently writing the final two chapters of the online book and recording readings of the other chapters for the podcast. A volunteer is doing the audio editing.)