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This is pretty old news dating back to this spring, but the Danish IT and Telecommunications board (IT- og Telsestyrelsen) has published an experimental REST interface OIOREST for public data such as regions, municipalities, post codes, schools, streets, and addresses. And example of a query identifying a street: http://oiorest.dk/danmark/veje?q=frankrigsgade.

OIOREST is a great initiative, and we hope it will be expanded to other datasources. There is one big concern though — it is not employing established data standards but instead using its own custom XML schemas.
What they should really consider is publishing the data as RDF in the Linked Data manner. That would make Denmark one of the pioneers not only in REST adoption, but also in the Semantic Web.