There are few sure things about the future of mobile marketing. The long-term effectiveness of micro-banners, 2D scan codes, branded apps, SMS interactivity, near-field communication technologies and the like are all open and interesting questions. If there is one model I would put my money on, however, it is mobile couponing. Few traditional marketing formats map so well to the phone. Instead of clipping, storing and remembering to carry these paper savings certificates, a mobile device makes it so much easier to locate the right discount and use it on the spot.