Sketchpad
This video is taken from a TV show about the software that Ivan Sutherland developed in his thesis at MIT's Lincoln Labs, "Sketchpad, A Man-Machine Graphical Communication System", described
Sketchpad 1963 and a Contemporary Incarnation
The original Sketchpad-Video from 1963 with comments from Alan Kay:
[video src=http://www.youtube.com/watch?v=495nCzxM9PI]