Two of the hottest cases in American IP law are the subjects of recent podcasts:
SCOTUScast presents a dialogue on the Bilski case now before the Supreme Court, primarily between Michael Risch of West Virginia University and Josh Sarnoff of American University Washington College of Law. The dialogue is moderated by Adam Mossoff of George Mason University. You can find the podcast here (hosted by the Federalist Society) and at iTunes (SCOTUScast).
The Intellectual Property Colloquium, a series of audio presentations on leading IP issues hosted by Doug Lichtman at UCLA, has put up a podcast on the Associated Press/Shepard Fairey copyright litigation, featuring Mark Lemley of Stanford (for Fairey), Dale Cendali, now at Kirkland & Ellis (for the AP), and Ken Richieri of the New York TImes. You can download or stream the podcast here.