Podcasts are great. I have occasionally used them to catch up on news or something I missed on the radio. But I really had no idea just how must there is available out there! I found many interesting podcasts, particularly in IT, Science and Education. I added several RSS feeds to my Google Reader (time to clean that up already!).
This one has many sessions quite relevant to this course:
Also, for anyone studying a language there's heaps of podcasts which could be used as additional learning or review material.