Starbucks lets you pay for that Trenta with the iPhone in your shaking, overcaffeinated hands

Expanding a trial that had already been underway in a few markets, Starbucks is now rolling out its Starbucks Card mobile app nationally with payment capability built-in, meaning you needn't reach into your wallet, pocketbook, or purse just because you're jonesing for that midday caffeine fix. Instead, you can fire up the app -- which supports the iPhone, iPod touch, and a number of BlackBerry models -- and hold up a barcode on the screen to a scanner in the store, at which point monies will be

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