The 'Big Data' service Infochimps now offers IP geolocation from Digital Element. Infochimps is best known for making huge datasets available as bulk downloads and through RESTful APIs. Digital Element has traditionally offered enterprise level services to large companies like AOL, CNN, and Ask.Com. Both companies hope that the Infochimps RESTful API interface and aggressive entry pricing will entice smaller companies to use the service.
Just in time for the next election season, the team at MAPLight.org offer the MAPLight.org API which enables developers to "illuminate the connection" between money and politics by providing detailed funding information for candidates for political office.
Before there was a Google Maps API, Adrian Holovaty created Chicago Crime to show updated crime data by location. Holovaty's lessons were later put into play in the Knight Foundation-funded EveryBlock, now owned by MSNBC. And now, EveryBlock has an API.