First of all, this is not an upcoming application for Windows Phone 7. This is an experiment done by a Windows Phone 7 Silverlight Developer Colin Eberhardt using Bing Maps control that accepts custom tile-sources. You can also render Google Maps data via a Bing maps chart control. So he tried this option with Google Sky tiles which turned out to be cool. He canâ€™t make it an application since usage of Google Maps tiles outside of Googleâ€™s service is a violation of its terms and conditions. He have made the application open source and its available for download. Can any WP7 developer try the same using Microsoftâ€™s Worldwide Telescope? Recently we posted on a similar app called Starâ€™s 3D Astronomy for Windows Phone 7.