If you like this, then you'll like this.  A type of categorizaton.
 It' called collaborative filtering. Used e.g. by amazon.com.
 Firefly Networks, Muze, Likeminds, Net Perceptions, and recoMentor make collaborative filtering packages.
are vendors of collaborative software, a type of agent software.
For music, Muze used themes, categories, genres, & subgenres. 

  (Firefly | Muze) & ("agent software" | "collaborative filtering"| "collaborative-filtering") &
refined by excluding: cleargif..., bradstreet...



"conceptual graphs" | "conceptual graph" From: 22/Jan/98

"Ned Davis Research" & ("Price/earnings" | "price/earnings" |PE | "P/E")