I liked the way AmigaOS did multiple desktops the best - most likely because that's the first time I was exposed to them.

To (try and) keep it short: Just like ~every window has a title bar, so did the whole screen. If you had another desktop (Public Screen, in Amigaspeak) you could just click the 'to back' widget and send your current screen to the back, bringing the next screen in the sequence to come to the front. Or even betterer - a small utility installed whereby you hold the left mouse button on the title bar, and then right-click to cycle through the screens.

The *really* cool bit was that you could drag the title bar down, and so have one whole screen sitting behind the other one, even if they were different resolutions and colour depths.

*Meerkat goes all misty-eyed for the (g)olden Amiga days*

ObAmigaZealotAddition: "And all this on 7MHz and 1MB RAM. Can't do that on these new fangled machines, sonny!"