For questions about the web mapping service provided by Bing
Bing Maps is a web mapping service provided as a part of Microsoft's Bing suite of search engines and powered by the Bing Maps for Enterprise framework.
One of the views offered is called Bird's Eye view, which allows the user to view aerial imagery of selected locations taken by low-flying aircraft. The angle of 45-degrees presents an oblique or isometric view which can help with better depth perception of buildings and surrounding geography.
Bing Maps (Wikipedia) was previously known as Live Search Maps, Windows Live Maps and Windows Live Local.