Thanks for all the great info. However, I think the $1 billion given out by Google in August is no longer operative for Admob revenue. They said they were on track to hit a billion. Since then in December IDC revised the numbers according to Olga Kharif in BusinessWeek:
"Google, owner of the world's most popular search engine, will widen its lead in the $877 million U.S. market for mobile advertising, ending the year with a 59 percent share, according to research firm IDC." (That makes their share $517 million or half of their original claim.)

http://www.businessweek.com/technology/content/dec2010/tc2010123_780712....

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