Today our Bing maps team announced the release of WWT application under Bing maps. This is a significant milestone and would help enable you to see a representation of the sky above you in real time from any location. You can navigate the heavens the same way you do Bing Maps by grabbing an area and dragging the map around (now a universe map).
On launching WWT Bing Maps, you can enable a telescope pointer, which you can drag onto the map — the map will fade to reveal the constellations above you. In addition, you can access numerous "collections" from the Worldwide Telescope Community, including Constellations, Solar System, All-Sky Surveys, Spitzer Studies, Chandra Studies, Hubble Studies, Astrophotography, Radio Studies, NOAO Studies, Gemini Studies, Messier Catalog, Planets/Moons, Earth (Bing), Panoramas, and Tours. You can click on a collection, which zips you down to Earth and changes the map style to Streetside (where available). Once you're on the ground, just look up. You'll see both your street and the heavenly bodies above.
The feature works in both Internet Explorer and Firefox as long as Silverlight is installed. You can try it out for yourself at Bing Maps and then clicking on the Map Apps link at the bottom of the page.