Google’s Purchase of Motorola Mobility Is a Response to Apple, Microsoft Sunday, Aug 21 2011 

Google\'s Purchase of Motorola Mobility Is a Response to Apple, Microsoft

Google’s purchase of Motorola Mobility protects Android via the addition of a significant patent portfolio and allows for greater integration into future versions of the Droid smartphone and Android operating system.

Android: Google’s Secret Weapon Thursday, Feb 24 2011 

Android: Google\'s Secret Weapon

Nokia and Microsoft Partner for Smartphones: Apple, Google and Qualcomm Win, Intel Loses Friday, Feb 11 2011