We’re always looking for new ways to engage consumers and build loyalty, so Plum Rewards caught our eye when we spotted a local sandwich restaurant using it as a frequency program. Plum enables you to send timely coupons and promotions as text messages to your customers on their cell phone while being able to track their visits and coupon redemptions at your business. It works using a PDA-style PlumReward device that consumers enter their cell numbers into every time they visit. You can also include the program in your other marketing efforts as well. Pretty cool. Check it out.