I just finished viewing a fascinating set of video case studies on Autonomy, an enterprise search and retrieval engine. The Autonomy search engine can scan through multi-lingual, unstructured databases and documents and mine them for useful knowledge content. After viewing case studies, the Autonomy folks have stumbled unto a better search method than what's available from Google itself, the 800-lb gorilla of search engines.
Though the companies' website downplays the technical background, sources indicate that the heart of the Autonomy search engine is based on bayesian statistical methods.
If you're responsible for doing any type of knowledge management in your organization, I highly recommend you review the Autonomy website and see how some very capable companies (Ford, Ove Arup, Belga) create knowledge management systems based on Autonomy.