Spotted at Sightglass Coffee in San Francisco: the sexiest POS set-up ever. Get yourself a custom built lazy susan wooden iPad dock, download the Square app and BOOM! The card reader plugs in to the headphones jack and with the iPad you can stream music to a stereo. Can your SAM4s do that?
Stream, charge, steam, decline, accept, bump that funky mix and write in your own damn tip!