Comment 69 for bug 317712

Nepomuk is a "Networked Environment for Personalized, Ontology-based Management of Unified Knowledge". The web site is http://nepomuk.semanticdesktop.org

http://www.linux.com/feature/144853 is a readable explanation of what it is supposed to do. Basically it's just a way to put meta-data about your files and emails into a searchable database.