Open Weather Map is a service that provides weather information with interactive graphics. The Open Weather Map .NET library by Joan Caron is an asynchronous project that interacts with the API. In the official site, users can review the API features that include current weather data, historical data, weather station network, weather forecast, map layers, and data from weather stations. Temperature shows Celsius degrees.
The New York Times made news earlier this year through its release of several APIs (our Campaign Finance API Profile and our Movie Reviews API Profile). There's been promise of more APIs to come, and the latest prototype created by The New York Times gives a preview of what is to come.
Google continues to expand its third version of the maps API to include features already in the second version. Most recently, they've added driving directions, which gives programmatic access to the routing data between two points. As with the rest of Maps V3, which was released in May, the team took a fresh approach, so some interfaces have changed.
The Health team at Bing used public data to create a Health Map application (requires Silverlight) that lets users visualize a number of health indicators, such as obesity and premature births, by U.S. county.