The YouTube video below shows a QR Code business application. Scanning a QR Code enables a couple to purchase concert tickets using their smart mobile phone in seconds avoiding a long wait in a line. The same scan serves as their ticket for entry into the concert.
QR Codes are used on advertising billboards to engage the consumer. The QR Code is scanned and the user is brought directly to the product allowing the purchase of the product to take place immediately. A whole new "point of sale" is created.
Just for fun! This video shows a contest to create a food that incorporates a scannable QR Code.
A good QR Code overview showing many applications.