This blog has previously discussed automated metadata creation and while I do believe that we still need humans to evaluate the subjective, utilizing tools to streamline workflow is always a benefit in the resource deprived information industry.
SKOSsy is a SKOS (Simple Knowledge Organisation System) which generates thesauri dynamically in English and German using DBPedia , an independent project to extract structured data from Wikipedia. SKOSsy produces ‘seed’ thesauri to provide a solid headstart in a thesaurus project, generating the data in mere minutes. Even with refinement, enrichment and a little editing, employing SKOSsy can save significant time.
For more about the possibilities, see this post from the Semantic Web Company.