QR Codes are popping up everywhere, ads, name badges, trucks, brochures, billboards and business cards. As diverse as the uses are, the opinions of using them are just as diverse. Initially, groups like realtors thought they would change the face of putting a house up on the market. Some say that it has not made a difference in the way prospective buyers research houses; some say it hasn't been enough time to make that judgement and consumers are just barely adopting these codes as useful tools. I think that the technology is here, it is powerful and easy to administer. Sure, only those with devices that can read these codes benefit now, but those numbers are growing in herds. So why not use this tool if you have an executable and viable application for it?
QR Code is a "Quick Response" Code. You can embed text, an image, your website, a telephone number, a promotion, etc. You can get them at many websites. Here's one: QR Code Generator
Add a QR Code to your book wherever there is data to share, an image to see or a website you want the reader to visit. Add these codes to your business cards, your marketing materials, trade show materials (including your booth), or virtually anything on which you think you can reduce risk of user error when they enter your info later, or to increase the user experience by adding expanded content that you normally wouldn't have room for. The code I have added above contains a paragraph of text.
When you are publishing a book in today's technology-driven world, there are lots of tools that can not only make your book more interactive for your reader, but can actually make your book exponentially more useful. This is one of those tools. It's not hard to do and it adds value to your product.