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http://www.cnn.com/2009/TECH/08/13/cell.phone.wallet/index.html

Wallet of the future? Your mobile phone

(CNN) -- These days, it seems that most Americans carry three things in their pockets or purses at all times: keys, a wallet and a phone. A survey says 15 percent of phone users in Japan use their phones to make payments.
In a multi-screen world, it’s increasingly important for advertisers to show relevant ads based on a user’s context: location, time of day, and device.

Mobile Metrics - Free Mobile Market Level Data | AdMob

http://www.admob.com/s/solutions/metrics
http://techcrunch.com/2008/07/08/scanlife-barcode-scanning-for-the-21st-century-and-beyond/

ScanLife: Barcode Scanning for the 21st Century and Beyond

In the grand tradition of UPC codes and CueCat , ScanBuy/ScanLife is attempting to barcode the world.
STAMFORD, Conn., December 17, 2007 View All Press Releases http://www.gartner.com/newsroom/id/565124

Says Mobile Messages to Surpass 2 Trillion Messages in Major Markets in 2008