Square Card Case released on iTunes App Store
Monday, August 22, 2011 at 2:47PM 
Square, the mobile payment company started by Twitter's Jack Dorsey, has released their new Square Card Case app, which will make customers' purchases much easier (assuming that the merchant being paid has joined the Square ecosystem).
Their site lists the process like so:
1. Open a tab - Next time you visit your favorite local spot, open the Card Case app on your phone and start a tab.
2. Say your name - When it's time to pay, just say your name. The tab you opened will show up on the register to finalize the sale.
3. Enjoy - You’re good to go. A digital receipt is automatically sent to you, with the option to tip at your leisure.
The app has been beautifully designed, and apparently also incorporates the functionality of the original Square app, which allows you to be the merchant and take payments from others yourself via their free credit card reader, which plugs into the mobile device's headphone jack.