A while back I posted about a fantastic book on the history of Xerox PARC, kindly recommended by Sir Jenson. In one of the chapters is an exciting retelling of the tale of The Mother of All Demos, where the outside world first got to see the mouse, hypertext, a/v conferencing, email, a gui, word processing, etc.
Reading the book, you essentially have to imagine what the demo must have been like. But now you can watch a video of the demo online.
More amazingly, there's even a project to re-create most of the demo's document editing/collaboration functionality on the web.
10 hours ago