GigaOM has a short infographic, based on data from Gartner , of the Smartphone OS market. The top uses stacked percentage bars to visualize the changing market over the last 3 years, and does a relatively good job at showing Symbian, Linux, and Windows mobile shrinking in the face of RIM, iPhone, and Android. I would complain about the lack of numbers, however they include those in the vertical bar-graph right below, which shows the exact same data.
See the fullsize graphic below, or at GigaOM.
iPhone vs Others: The Mobile OS Market – GigaOM.
