This has been mentioned on peterme, but not here, so I thought I'd say a little something about it.

I got a card in the mail yesterday extolling the benefits of Endeca and their “Guided Navigation (SM).” Sounded like another company coming up with a proprietary term for a common technique. And, well, basically, it is.

“Guided Navigation (SM)” is faceted classification. They clean it up a bit, expose the facets in an intelligent way, and have an integrated search, but don't let their service marked slogan make you think they've invented something new.

What they do have, however, is probably the best explanation of faceted classification I've seen, and since many have mentioned the need for a simple FC example/tutorial (CrocoLyle, Parallax), I thought it was relevant. If you already understand FC and can explain it well to others, well, this is probably old news to you.

Their Flash demo with narration (also available without narration) is an easy-to-understand description of FC, applicable for developers, IAs, and business people, and it'd probably even pass the mom test too. (It's also a great example of a good use of Flash.)

I'll probably use the demo because it explains faceted classification at a high level better than I can, but I'll make sure to mention that the idea certainly is not proprietary, and there are other technologies and systems (i.e. FacetMap, Flamenco) that can do the same thing.