With growing popularity of Bing, the IT giant Microsoft has given a genuine reason to smile to its fans. The company has announced that its Windows Phone 7 SDK features Bing Maps as its default map control, and also this application goes free for other platform as well..
According to Microsoft official blog, “More and more developers are choosing Bing Maps, and today there's great news for all of you - the new Windows Phone 7 SDK features Bing Maps as its default map control. But it's not just about Windows Phone - we've made Bing Maps free for you to create consumer-facing mobile applications on any platform.”
Windows Phone 7 SDK can be downloaded from here: http://developer.windowsphone.com/windows-phone-7/
For all terms and condition, one can check out http://www.microsoft.com/maps/product/mobileterms.html