DBpedia extracts structured information from Wikipedia and publishes it as RDF. This allows for incredible queries against Wikipedia data, such as Soccer player with tricot nr. 11, playing for a club having a stadium with >40.000 seats, born in a country with >10M inhabitants.
I recently added support for geo-coordinates to DBpedia and built the flickr™ wrappr, a proof-of-concept work that provides photos for a given Wikipedia article using geo-coordinates and multilingual labels. The benefit: It is a fairly efficient and accurate way for a machine to find a picture of something. It is now part of the W3C SWEO Linking Open Data community project.
I really like the pictures it finds for the Eiffel Tower:
Update (04/10/2008): ReadWriteWeb says "This is pure geek hotness", and Tim Berners-Lee says “This is a neat addition”!
Update: Mashup of the day at ProgrammableWeb (10/17/2007) and at Mashup Awards (01/10/2008)!
