CMS Faceted Product Directory
http://www.cmsreview.com/indexFacets.html

Doyle, Bob
CMS Review
2003

Abstract:

A state-of-the-art knowledge base with a user-controlled faceted classification scheme. Most web directories (DMOZ ODP, Google, Yahoo) hard wire their category hierarchy. Here you can select the facet you want at the top of the hierarchy, then another facet for the next layer in the hierarchy, etc. A do-it-yourself taxonomy of content management systems.