AR is regularly used to enhance printed materials by giving readers additional content or location-specific information, wherever the reader may be. And publishers can use it to connect advertisers, allowing readers to experience products at home before buying, or to provide links to additional digital materials, such as videos or even online stores.
Check out James Dearsley's channel for more videos.
***If you're interested, Layar is one of the largest AR providers and provides some relatively inexpensive (i.e. less than $5.00) options to give it a try, or if you have bit larger budget then give Augment a look.
And there is a very helpful "How-To" page for Layar here, and many of the tips will apply to other providers as well.