Farhad Manjoo is excited about Card Case, an app that lets you pay with your name without even taking out your smartphone:
I used it at a couple of small stores in San Francisco. In one case, I walked into Pinkie’s Bakery and asked for a cupcake. The cashier told me my total, and I said, "Put it on Farhad’s tab." She saw my name and photo on her iPad, tapped it, and I was done. A receipt was sent to my phone. The experience was magical—almost creepily so.
The Dish 