Social cataloging applications

A social cataloging application is a web application that allows users to catalog items (ie., books, CDs, etc.) owned or otherwise of interest to them. Once cataloged, such applications generally allow users to share their catalogs with others, and interact with others based upon shared items.

YMDB still exists, but is now located at shompy.com. YMDB now re-directs to IMDb, probably due to a lawsuit.