Small businesses around the world are jumping on the credit card bandwagon due to new technologies that allow the acceptance of credit cards through smartphones and tablets. Emerging vendors like Square Inc. and VeriFone Inc.'s Sail provide small hardware dongles that attach directly to mobile devices and provide inexpensive, seamless credit card processing. If you haven't already seen one of these devices in a taxicab, small shop or with a sidewalk merchant, it won't be long until you notice the technology in use.