This could come in handy if you ever wanted to create a city.
Not that I can come up with a time where that would be relevant.
But still. You could.
This is some serious 3D work. Love the way he creates the buildings and applies colors and textures afterwards:
via Kottke.
The first clip shows some old, yet really innovative GUI stuff, taking into account that it was developed in 1963. The guy presenting the Sketchpad is none other than Alan Kay himself:
YouTube – Ivan Sutherland’s Sketchpad.
Also have a look this modern prototype Curve Model sketching application, but don’t be too impressed with how easy it looks – I think it’s pretty difficult, but possible to manage with proper training and a bit of experience:
ILoveSketch from Seok-Hyung Bae on Vimeo.
More on ILoveSketch on http://www.dgp.toronto.edu/~shbae/ilovesketch.htm