In 2005 I presented the paper at the ITI conference. The video below shows some of the ideas from the paper. At the time (after reading Ravisio's paper) the desktop seamed a great space for managing files. I imagined something like (temporarily suspended) Archy - a zoomable interfaced desktop (taken form Pad). But with files and applications. But a lot of us use hierarchies as well :).
Here's a demo video (I have no idea why the mouse pointer is always few centimeters below what it is clicked):