Stephen posted a link to this newly rediscovered video of Marshall McLuhan discussing media on CBC’s Explorations documentary series in 1960. This was 4 years before Understanding Media was published. It’s well worth watching. It strikes me that this kind of deep, theoretical presentation/discussion would likely be impossible to broadcast now.
UPDATE: As of October 27, 2010, the video was taken down from YouTube, due to a copyright violation claim by CBC. I suppose they’re planning to rebroadcast the 50 year old video at some point?
I’m sure McLuhan would have something to say about the message of copyright takedowns and the ephemeral nature of corporate digital media.