Most people my age hate any money that is paper. Checks? You have to actually write out the amount you want to spend, and then balance a checkbook? And bills are only in possession in a straight line from ATM to merchant. But you still need the paper for small time purchases like farmers markets, donating to a candidate for a fundraiser or tithing at church. Not anymore. Check out squareus.com. They enable even a chalk painter in New York to swipe plastic and get a donation with an iPhone. Next up: persuade my churchwe need to strap a square enable iPhone to the offering plate.