DBpedia is an interesting project out of Leipzig and FU Berlin to extract structured information from Wikipedia and make it available on the Web and via SPARQL queries. See this ESWC 2007 paper (What have Innsbruck and Leipzig in common?) and slides for an upcoming talk in the WWW2007 developers track. Michael Bergman has an extended post about the project and its possibilities.

Related posts:

1. WIkiMedia meets the Semantic Web
2. The Semantic Naturalist: Ecoinformatics meets Semantic Web
3. Elvis meets invasive species on the semantic web
4. OWL Pizzas
5. Faviki uses Wikipedia and DBpedia for semantic tagging