If I were to have my students subscibe to a Podcast it would probably be TED Talks. TED is a gathering of great thinkers who share brief presentation on technology, design, humanities, and much more. Whenever I get a chance I watch ones that I have not seen before. Some of the talks relate to what is taught in my classes. There are many more that doesn’t link directly, but they do inspire you to think about what is happening. All of the podcasts that I found that deal directly with CAD are no longer being updated.
http://podcast.net/ is dead