When I can't get my audio learning fix from our many Modern Scholar courses, I turn to podcasts. Podcasts are audio or video-based shows available for download, streaming, or online subscription. Many of them regularly update in weekly or monthly installments, so there is almost always a new episode to catch up on or many past installments to explore.
The 365 Days of Astronomy Podcast is a project that will publish one podcast per day, for all 365 days of 2009. The podcast episodes are written, recorded and produced by people around the world.