The New York Times' (NYT) list of web services includes some impressive APIs that make it easier to access and track information about a range of interests, including best selling books, real estate, people, articles, and the United States Government. The NY Times development team has been incorporating feedback from users in order to make changes and improvements on a regular basis. Most recently, NYT developers answered a request from users to add information about bills and speeches to its Congress API:
The non-profit built for "opening America's government" has created an app to show off its Congressional data, as well as its API (our Sunlight Labs API profile). You can't get this app on the web, though, as it's available exclusively for the Android phone platform.