EDX -Founded by Harvard University and MIT in 2012, edX is an online learning destination and MOOC provider, offering high-quality courses from the world’s best universities and institutions to learners everywhere.
University of Bath in the UK has this Podcasts of Public Lecture Series.
Nature has its podcast archive.
Stanford on iTunes
http://itunes.stanford.edu/ – Faculty lectures, interviews, music and sports.
University of Washington’s Cryptography Course
Computer Science video lectures
|Scientific American (podcasts) from a popular science magazine,
|Openculture Master List of 1150 Free Courses|
|1150 free online courses from the world’s leading universities — Stanford, Yale, MIT, Harvard, Berkeley, Oxford and more. Over 30,000 hours of free audio and video.|
|Findlectures: faceted index to thousands of hours of free online lectures|
|A curated database of free lectures, over 20,000 hours of audio, http://findlectures.com/|
[Edited from Photomedia Forum post by T.Neugebauer from 2006-2016 ]