The US YellowPages, owned by AT&T, has revamped its developer offerings to launch a robust set of YellowPages APIs. The company also added a modern developer portal, with the ability to track API calls and test queries. The new service is part of a growing trend to share more local data via API. To kick off the new service, AT&T also launched a contest for developers.
It's always exciting to see those outside the web industry using an API to improve their sites. NY Times First Look blog has a great example of what Dallas Public Library has done with the Best Sellers API.