I rescued from cassette this talk that Marshall McLuhan gave at Johns Hopkins University in the mid 1970s. I have not found an audio file of this talk anywhere online. So far as I know it's an original contribution to the archive of McLuhan audio. Enjoy (audio starts at about 00:04).
This blog includes
many posts that explicate and apply McLuhan's insights.
(note added 7/17/2010) : I've had trouble getting audio players to work right on this page. If you can recommend a reliable player to embed here, please let me know: heresiarch
[at]starlarvae.org .
Rare McLuhan audio
