Thing12 - Podcasts
As I posted on the 23 Things blog, I am a large consumer of podcasts. I have a pretty wide variety of 'stuff' I listen to on a regular basis, but to the point of podcasts I might use in class, I would answer it this way: I create my own podcasts for use in my class.
I have found that recording my lecture portions of my class with Audacity and posting them in our LMS helps my students in a couple of ways.
First, the students that miss class can review the lecture, and second, students can review the material at their convenience.
I also suggest podcasts for my students to put in their download list: Security Now, Buzz out loud, and TWiT with Leo Laporte.