The team over at Cognified, Adobe Solutions Partner with many CQ5 projects under their belt, have taken advantage of the extensibility of CQ and integrated it with OpenCalais.
OpenCalais extends CQ5’s built in tagging & SEO support by automatically analyzing submitted text and generating rich semantic metadata, part of which are entities that can be used for content tagging. OpenCalais uses many techniques to generate this metadata including natural language processing and machine learning. The toolkit can find entities like people, places, organizations, technical terms and many, many others.