I really like the idea of Zooming Interfaces. I think they provide a better solution to having multiple documents/objects on the screen than the current overlapping-window pattern. The demo linked above has some pretty severe limitations, but even so I found it easier and more enjoyable to explore than a web site with a comparable number of documents on separate pages.

For a slightly wilder example, try Dasher, a keyboard replacement based on zooming letters. (The Java applet did not work for me on Firefox 1.5.0.6 on Windows.)