Source: Bigstock

Under the broad label of "open data," governments around the world are opening up increasing numbers of fascinating and often valuable datasets to public access, in many cases, via API. As a recent article in Network World notes, London makes nearly 500 datasets available, and even smaller cities in the UK like Leeds make hundreds of datasets available as well. Perhaps most interesting of all is the initiative by the city of Copenhagen, called City Data Exchange, which takes o...