Additional Videos for your historical watching pleasure
The Computer Chronicals was a computer show broadcast from 1983 - 2002. It has some great historical shows (from the actual times) showcasing various peices of computer hardware. Quite entertaining to watch now, but also a great place to learn why certain machines (especially the Amiga) were so revolutionary in their day - which any oldskool scener will be able to tell you! Enjoy.
The New Amiga 1987 - Amiga 2000 and the Amiga 500. Video Toaster, MIDI + more.
The Amiga 3000 1990 - Amiga 3000, Amiga 2500, inc. first release of Lightwave 3D
Computer Graphics 1984 - Great 3D technical demos from Sillicon Gfx. A record breaking fill-rate on an Apple IIe (watch it go! Oh the power). I'm certain shows like these helped inspire a generation to code their own demos and cracktros.
All these videos are hosted on archive.org Heaps of other great historical stuff on this site.
If you haven't already, be sure to check out demoscene.tv which has some quality TV channels which focus mainly on the European demoscene. Be sure to watch the DTV releases channel as this shows party reports and interviews with many of the demo groups and sceners you may have heard about.