The Amstrad PcW16
Text Mode User Interfaces
Banana Junior (Note: I made this page as an April Fools Joke)
Remote GUIs
The Holmes 1-Touch Heater (a real-world UI)
The Real World Desk
A tribute to Firefox 1.5 and the OS/GUIs that it runs under.
Microsoft Mouse - 1983
Microsoft Word for DOS 1.15
What made the PC, Mac, and Linux so great (or not)
Magic Desk I for the Commodore 64
Norton Desktop for DOS
New: IBM Common User Access Samples 1987
New: Abusive Appliance Interfaces (a rant about more real-world UIs)

Good User Interface Design Tips (if you want to whiz off your users)