At the California TED conference, Microsoft showed its latest additions to the Bing Maps mapping system. The main innovation was the demonstration of the new features of the StreetSide system, an analogue of Google StreetView. Interestingly, materials from the Flickr photo database are used here as street photos, where images are often published indicating the exact coordinates of the location of the shooting (geotagging). That is, Microsoft uses a crowdsourcing program instead of driving its cars through the streets. Moreover, they managed somehow to integrate the stream from webcams to the photograph of the Bing Maps terrain, and the picture is superimposed in real time. Words can not convey this, you need to look at the video .
Who does not have "silverlight", here's a video from YouTube.