Although QR codes, or quick-response codes, have been in use for nearly 2 decades, companies are just beginning to tap the power behind these black-and-white squares that are popping up everywhere. And with smartphone use on the rise, users are reaping the benefits of these QR code campaigns in a big way. Wasp Barcode Technologies, which has been tracking QR codes, developed a list of the best and most creative QR code campaigns of 2011. Here are the highlights: Tesco.com: This U.K. supermarket-chain owner found an innovative way to connect stores and consumers by placing big food images on subway walls in South Korea. Using the accompanying QR code, consumers can scan individual food items, which are then loaded into virtual shopping carts. Shopping orders are processed after virtual checkout and then delivered to consumers' doorsteps.
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