Thesauri have been an important tool in Information Retrieval for decades and still are. They have the potential to greatly improve the information management of large organizations, but they are still underused in content management systems, search engines or tagging systems. In this article we want to describe these use cases for thesauri, in which way thesauri have to be structured in order to be suite different use cases and how Semantic Web technologies in the thesaurus management system can help to realize them. The PoolParty suite consists of a web-based thesaurus management system, a concept extractor and a semantic search server, which is completely built on top of W3C's semantic web standards.