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.
Take a look at the mashups that we publish on ProgrammableWeb and you can easily find services that will show you where you can see beautiful things. Maps that show the origin of photos from Instagram (Gramfeed) are becoming more and more popular. You can also find services that will tell you where you can taste great wine (AmericanWineryGuide). Today however, we will highlight a mapping service that focuses on where you can hear different sounds. I present to you, the Sound of the City API.
If you require accurate real-time world weather data for your application, the weatherstack is worth considering. The weatherstack API provides historical weather data back to 2008 and measurement units for metric, scientific or English. This article provides an introduction to the API.
PubSubHubbub. Say that three times fast. If you're not familiar with PubSubHubbub, it's an extension of the RSS and Atom protocol that allows the feed to push content out when it's updated. That's just the sort of technology we should see from check-in APIs like Foursquare and Gowalla.