Woah, Android is doing well. According to Gartner, worldwide Android (25.5% marketshare) is second only to Symbian (36.6% marketshare), and that gap is closing quickly.
http://www.gartner.com/it/page.jsp?id=1466313

In one short year, the marketshare leapt from 3.5% to 25.5%. It just goes to show how volatile the market is and how quickly things can change. In another year, Windows Phone 7 could be the new leader -- but I doubt that very much .