The quickest way to get either/or 'reader' is to go to your preferred App Store and download your preferred free version (be sure to read the instructions & conditions first.) Once it's on your phone, turn the app on, point the camera towards the square box (such as mine on the right), and the app will launch the corresponding website, (or send you a message / image / contact details etc).
Even more exciting, I've finally made the time to learn how to generate my own QR codes to link back to my website.
There are many free QR code makers, I use goqr.com. You enter the site you want to link to and it creates a unique QR code for you to download.
So what does my QR code do? Well, if you've ever looked at the paper crowns that my daughter wears in many photo shoots (click here to see an example) and thought "I'd like to make that" well now you can! Simply point your smart phone at your computer screen, scan the code and it will take you to the free themed-party ebook - download it, scroll to page 44, print out the crown and follow the how-to instructions... easy!
If any of you have a QR code reader, I'd love for you to try it out, and leave a comment below or send me an email to let me know how it works... until then; stay crafty this weekend!