You've seen them a lot in magazines lately.
In a mastermind meeting I had Friday with fellow marketers Rod Walker and James Erickson, I showed them a postcard I was mailing to promote my new book (which you can pick up here at Amazon.com).
Not only did I include a link to buy the book on Amazon, but I also showed them how I used the QR Code.
Pretty clever stuff.
However, being the smarty pants James is, he added, "Jerry, you should include a QR code on the cover of your book which would lead book buyers to an "insiders' page" created just for buyers of the book."
So, the next book I release, I'll make sure it's got a QR Code on the outside cover or at various places in the book to take buyers/readers (sometimes not one in the same, eh?) to exclusive web-content sites.