Sorry for the late response, I'm finally catching up on my mailing
lists.
I do have another alternative to add; that is the side-by-side listbox
view (aka, "column view") that Apple uses in the Mac OS/X. This view has
been around for a while; it was used in the NeXTStep operating system
which was later bought by Apple as the foundation for OS/X.
iTunes also uses it (aka "Browse" mode) and iPods use a single-frame
version of it for its menus. On the iPod, the main distinguishing
attribute from other types of menus is the animation from right-to-left
as the user drills down.
Rather than trying to explain it in writing, here are some links that
should do a better job...
Web mock-up of a Finder window
http://lixlpixel.org/webfinder/
iTunes "Browse" mode
http://www.atpm.com/7.02/images/itunes-browse-the-library.gif
iPod tutorial
http://youtube.com/watch?v=4bfwOZ3iZOY
NeXTSTEP
http://en.wikipedia.org/wiki/NEXTSTEP
Disclaimer: I'm not advocating this as the ideal solution to the OP's
dilemma, just another design alternative for brainstorming. It's
definitely a challenging design problem!
---
Uhl Albert
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