You can't go past the Computer History Museum as a starting place on this subject.
Another great computer museum.
By Ken Polsson
A real blast from the past - the legendary comic strip from the 1980s and the beginnings of the mini-computer era.
A site dedicated to the great visionary Douglas Engelbart - video, audio and archival material
Pictures, parts and early personal computer memorabilia
It's hard to imagine that so many of our common computer applications came from just one laboratory - Ethernet, Windows, word processing, maybe even the Internet! This is the history of a hotbed of innovation.
This really neat collection of old TV ads for personal computers is well worth a visit
Book by Peter Salus