Twitter co-founder Jack Dorsey and the quiet startup formerly known as Squirrel are finally opening up a bit. The company now called Square, as we noted back in October, has launched a website for its iPhone payment dongle, although it's still in somewhat private beta testing. TechCrunch managed to catch up with Dorsey, who gave a brief overview of the product and then showed it off by charging $4 for a cup of coffee -- so it goes in San Francisco. See Square in action after the break.
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