BBC - Save Our Sounds Map
Here's an oldie from the BBC. Last year the BBC created this Bing Map to help preserve endangered sounds for future generations. The map lets anyone submit a recorded sound to the map and users of the map can play the submitted sounds directly from the map.
There is a lot of fun to be had from this map just from listening to the interesting soundscapes around the world.
The BBC is a great user of Bing Maps. If you want to see some of the other Bing Maps created by the BBC the Bing Maps Blog has compiled a list of some of their favourites from the venerable broadcaster.