As i said, we could use
Super Search as the card catalog
(homenodes are the cards).
(elaborate example deleted)
Update: arhuman's idea would work except there
would be lag because homenode changes are instant whereas
stats are not. Tyke's concern with the obscurity problem
could be addressed by adding some mention of it to one
of the site FAQs, and book-related form
elements in super search.
ps - jcwren says homenode tags update every day at 3:00AM EST/EDT
pss - homenode tags can now be scanned immediately
Update: Virtual Distributed Library Online!