Bing have released the Bing Map App Software Development Kit (SDK). This release gives developers the ability to create their own map apps built on top of Bing Maps and hosted on bing.com/maps.
Once developers have created a Bing Map app, they are encouraged to submit it to the King of Bing Maps Challenge. The challenge starts today and concludes on July 25, 2010.
Bing have also released a new mapping app Weatherbug
With WeatherBug you can check weather around the world or select an observation station to see the current conditions. Observation stations are pinned to the map and you can layer Doppler and satellite weather imagery over the map view.
Observation stations include National Weather Service locations, WeatherBug Backyard stations, and WeatherBug stations, which may include current and next day forecasts, camera images and links to radar imagery.