Here's the blurb: http://www.guardian.co.uk/open-platform
Here's the documentation: http://api.guardianapis.com/docs/
And don't forget the various sets of data they've compiled (from government and other sources) for the mashing thereof: http://www.guardian.co.uk/data-store (pointing at Google spreadsheets)
Quite how we'd be able to use the Guardian API here will take a little consideration (and the answer may be "not at all"), but it's all good. It looks like newspapers will have to start tackling (or asking) their own version of the question that Richard Light recently posed and that Mia is chasing us museum tech types to answer: what can we standardise across the APIs that are starting to emerge from museums, and where do we start?