I just came across 37Signals' Sortfolio (http://sortfolio.com/),
which allows users to filter through portfolios.
It reminded me a little of Google's Fast Flip
(http://fastflip.googlelabs.com/), although that interface offers
minimal filtering and meets different user needs.
I'm interested in finding similar interfaces that showcase pages and
allow extensive filtering. Can you think of any more examples? (It'd
be nice if they were as well-executed as Sortfolio, naturally.)