I added a new link today: www.noircast.net. It is the one podcast (actually two) I set aside time to listen to every month. Shannon Clute and Richard Edwards are devoted fans of both film noir and crime fiction...and they have a podcast for each. Out of the Past investigates film noir, both from the glory days as well as more recent entries. Behind the Black Mask investigates crime fiction with in-depth author interviews. I have learned quite a bit about the crime field with these podcasts and this new information has shaped my writing.
If you need further proof of their importance, they were recently the official podcasters for Noircon 2008.
(Pssst. One of my goals in my professional life is to be interviewed by these guys. I just hope I have some answers to the deep questions they ask.)