Here's the few details Google CEO Larry Page disclosed about Android as part of the company's third quarter earnings call. I must admit I don't understand how this rate of growth is even possible.
Page noted that there are 190 million Android devices (up from 130 million in July). More importantly, mobile revenue is now at a $2.5 billion run rate, up 150 percent from last year. Most of these revenues presumably comes from mobile search ads. Page would not break out the mobile search versus display ad revenues specifically, but given its dominance of mobile search it is likely that is where the majority of its mobile revenues are coming from.
-TechCrunch, October 13, 2011