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viterbiSearcher is right in stating that one of the commonplace uses of ontology is classification systems. What is missing is the fact that the internet has made this a very active field.

Most search engine companies employ ontologists to dream up their classification systems. The Open Directory Project is an attempt to publish a directory of the web (with categories, like Yahoo) by volunteers. Go there and put "ontology" into their search engine and you'll find that ontology is indeed a hot topic these days.