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It's been a year since Google (GOOG) released Android OS, the open-source smartphone operating system widely perceived as the most likely to overtake Apple's (AAPL) iPhone in the long run.
As it happens, Google this month also purchased AdMob, the world's largest purveyor of mobile phone advertising. So this seemed as good a time as any to take a snapshot of the changing smartphone marketplace, as measured by ad requests to AdMob's network.
We reviewed a year's worth of AdMob data -- including the October numbers released Monday -- and charted it on the graph at right (reproduced full-size below the fold).
There's a bias in the data, since AdMob ads run better on iPhone OS and Android devices than on, say, Research in Motion (RIMM) BlackBerries. But the trends are clear.