I thought you might be interested in Open PSI, a collaboration between the University of Southampton and the UK government, lead by the National Archive, to trial a new form of community provisioned information service.

we are trying to spark interaction between government information providers, academic researchers and information intermediaries, specifically to bridge the gap between those researchers who may not have all the technical skills or data knowledge to answer important research questions.

We are exposing UK government data in the Semantic Web standards, RDF, etc. We have a SPARQL end point so data mashers can issue query requests (a form of open API) that allows mashups to be created quite quickly.