At the start of July a repository of university podcasts from UC Berkeley disappeared from the Internet. This was the best repository of lectures I was able to find anywhere on the Internet. Some have been lost forever, some have gone to iTunes (= may as well be lost forever) and some to Youtube. Since iTunes discriminates against Android users I’ve started a repository item called UCBerkeleyLectures on Archive.org and am beginning to upload the audio that I have there. At the moment there is only one course uploaded (because of trouble parsing metadata), but I have audio from a couple of dozen.
If you have audio from other courses and would like to help please let me know.