From a distribution standpoint, Bing is one of the search options on the iPhone and was one of the top 10 free apps in the Appstore in 2010. Bing is the default search engine for a number of Android, RIM and Brew devices on Verizon, as well as the default search engine on a number of RIM devices from other carriers. With the launch of Windows Phone 7 and Windows Phone 7.5, Bing is the default search option everywhere Windows Phone ships in the U.S. on Android has grown more than 270 percent — and more than 100 percent on iPhone — over a six-month period ended April 2011. To date, our app activations in the U.S. have exceed more than 22 million. Get the full story at Search Engine Land