http://www.tightwind.net/2011/01/android-isnt-about-building-a-mobile-platform
This is a great article on google's mobile strategy. It is a no brainer google did it for the mobile ad, a nature extension of its core business. But how does developing android help empowering google in concrete and specific ways? This article offer many enlightening insights on google's mobile strategy
some of its interesting views:
1. android lowers the threshold of mobile manufactures, hence commoditize the hardware business and turn it into (software) service business where google excels at.
2. expand the ecosystem that is more ad-reliance by encouraging free mobile app
3. participation of Google will accelerate the adaption of mobile, thereafter mobile ad