First Droid, then AdMob: Google goes for Apple's jugular in mobile business

The $750 million acquisition of mobile advertising network AdMob by search giant Google (GOOG) signals a new stage of the battle for the soul of the mobile Internet between Google and its arch-rival Apple (AAPL). The acquisition gives Google the strongest player in the fast-growing market for putting advertisements on smartphones. And it's the latest brawny move by Google in an unspoken war that has broken into pitched battle in the past two weeks.