bruce said:
>   support search by subject.

subject-based systems have utility,
there's no doubt about it, especially
ones that drop the physicalistic notion
that items can only be placed in one place.

and as i said, it's orders-of-magnitude easier
to leverage an existing system than inventing one.

but if you _are_ going to invent _any_ kind of system,
it should be a collaborative-filtering one, not any type
of category-based one, no matter how flexible it might be.

tomorrow's people won't just want to "find" a book, they will
want to be pointed at the exact book they'd most like to read...

any system that isn't able to account for their individual preferences
will eventually end up being ignored by them, and thus wasted effort...

-bowerbird