A user writes "A development team at the University of Illinois Champaign-Urbana has released a 3-dimensional file browser called 3DOSX as a test of the feasibility of the technology. This program uses OpenGL to render a file system as a series of floating 'platters' interconnected by semi-translucent beams of light."
I tried this on my old PowerBook G3/400, first from the source and then from the disk image, and then realized I don't have the required OpenGL-accelerated video card. Doofus am I! Be not like me! (However, it does work, albeit very slowly, on a new iBook/600). J
adds: Nice and fast on an old G4/500 with a Radeon.