Computer Networks: The Heralds of Resource Sharing - Google Video
Fascinating 1972 video (available from Google) which describes the creation of the Internet by the people who did it--even before it was called the Internet. They touch on the technology and social changes they envision.
I found the video sobering on two fronts. I was at university in 1972. First, despite (as I remember) these ideas being in the minority and controversial, they were right. Second, I remember discussions of these issues at late-night discussions in the dorm and I used equipment like that shown in the video.