My wife was at a charity fund raiser that was selling a lot of items made in Africa to support "Africian Life" Charities. All the volunteers with smartphones were turned into cash registers by using the app "Square" You plug in a little card reader into the headphones jack and the app works off an iPhone or Android phone. They take a 2.75% charge for using it. Folks were educated in about 5 minutes on how to load, swipe cards and complete a sale! Since i do craft fairs every once and a while, I signed up. Thought it might work for FTFs, Craigslisting, or when you have to split a check at dinner. Wonder what folks response to it might be.