One of the tech pillars of KDE Platform 4.x is Nepomuk, a framework to store and query (via SPARQL) RDF triplets organized in standardized ontologies. This is u

One of the tech pillars of KDE Platform 4.x is Nepomuk, a framework to store and query (via SPARQL) RDF triplets organized in standardized ontologies. This is used as the backend for Spotlight-like file metadata indexing, but also user-generated file metadata (comments, ratings), PIM data (people, messages) and various other relationship-y stuff. It's dev-accessible on the app level and seeing increased usage there over time, e.g. the Bangarang mediaplayer uses it for its media library. As time goes on it will increasingly unify the notion apps have of "people" and associated data (conversations with them, content authored by them, etc.) across the desktop, among many other use cases for a generic metadata and relationships store. Plasma Active allows you to set up "activities", which are separate workspaces with associated widgets, apps, documents, etc. and Nepomuk is used to store those associations, generate recommendations, and so on. So no, it's not buzzword bingo. We've barely scratched the surface yet, though; the future is wide open.