The Semantic Web provides a common framework that allows data to be shared and reused across application, enterprise, and community boundaries. (more in http://www.w3.org/2001/sw/)
See also:
SemanticMoin - (MoinMoin as a SemanticWiki)
SemanticWiki (general Information about SemanticWiki)
SemanticWikiWikiWeb (The goal is a collaborative approach on writing ontologies using ResourceDescriptionFramework (or better WebOntologyLanguage) as OntologyLanguage. ))
please check the ideas in MoinMoinIdeas/EduardoMercovich (MoinMoin could add a lot of potential if we work on a SemanticMoin.)