Nielsen has published two rather interesting graphs today that show what the US smartphone market looks like based on manufacturer & operating system, and age & operating system.
When it comes to the market share of operating systems and manufacturers, the results should come as no surprise. While Android leads the OS race with 29% of the market, followed closely by Apple at 27% and RIM at 27%, the two largest manufacturers using Android only own 12% (HTC), and 10% (Motorola). As Apple and RIM manufacturer their own handsets, they clearly have a big lead here.
So what about age and operating system? The numbers here are fairly evenly split among all operating systems. If anything, Android has a very minute lead in the younger markets.