Harper Collins is using Clickable Print. Sooner or later someone is going to offfer them printernet publishing.

HarperCollins to Use 2-D Barcodes in New Mobile Marketing Program :
Book Business:
"HarperCollins Publishers has announced plans to launch a viral mobile initiative using 2-D barcodes, a new technology that links the print world to mobile. The codes, located on the back of book jackets and on marketing materials, will connect to a mobile site, with exclusive content about the authors and book.

To access the content, users download a free application (http://m.harpercollins.com) to their smart phone, take a picture of the 2-D barcode with the phone, and then the content appears on the phone.

The promotion kicked off June 16 in the United States, Canada and Australia, with the release of the teen novel 'L.A. Candy,' by Lauren Conrad. Users of the application can access video of Conrad, a Q&A with her, or share the new site with their friends via SMS (short message service). The site also can be accessed directly at http://lacandy.mobi."