It is one of the Great and very Interestig web application devlope by Microsoft ,
there are some reason to devlop this.
The Local Impact Map are conatin around 400+ Stories about the Program of Microsoft around the world.In that you can see it includes the Photos videos and more and more Visual Effects.
It is very interesting and easy to use , i like the one of that feature of Deep Zooming of Map, its really cool and very fast , Its not a ' free mouse-wheelin ' where you can zoom the Preticular location , they are taking advantage of Deep Zooming of image along with zoomo for Controlled Transition.
Microsoft’s Silverlight-based Local Impact Map
plz have a look at this cool Local Imapct of Map