Mobile coupon engine Cellfire launched yesterday for Cingular users. The tracking and marketing benefits that online and mobile coupons offer will make this a big area of development in the local space over the next year. As more third-party software developers build platforms, more carriers sign on and more merchants participate, it could become a powerful medium. The ball is starting to roll, thanks to the efforts of companies like Cellfire and ZiXXo. This is only the beginning. More from TechCrunch.