One of the most bountiful sources of educational podcasts is perhaps the University of Oxford podcast series. This is a free site featuring public lectures, teaching material, interviews with leading academics, information about applying to the University, and plenty of other useful material.

The user will be able to access the material that may be in audio, video or document format. In the full list of all series, you can browse the podcasts alphabetically, or by the number of episodes, or by the date of update, and of course by the popularity. Alternately, you can look up the featured podcasts lists – of people, series, and departments & colleges.