Imagine if every book had a semacode or QR code associated with it, with ties to a book or author site. From VentureBeat:
A previous Jupiter Research report stated that 70 percent of consumers surveyed had no interest in using mobile coupons, but the mobile world is evolving quickly. Semacodes or QR codes, two dimensional square barcodes, are one example. Using a cellphone camera, a consumer simply takes a picture of one of these codes and a phone with the correct software can translate it into a coupon or a URL leading to where a coupon can be found. These ads are popular in Japan and can be found
everywhere from coffee cups to billboards. Now Google is working with the technology in the U.S. under AdWords.