The iPhone will be losing some of its popularity among developers, advertisers, and publishers next year as the app makers try to diversify their offerings to other platforms. In 2011, developers will be concentrating their efforts on making apps for Windows Phone 7, Android and the iPad, according to a report released today by Millenial Media, Digiday, and Stifel Nicolaus. The analysis--based on interviews with developers, publishers, and advertisers--shows that 29 percent plan to support Android in 2011, 20 percent will focus on the Windows Phone 7 and Apple's iPad, and 12 percent will target RIM's Blackberry platform. By contrast,...