According to Wikipedia:
"A QR Code is a matrix code (or two-dimensional bar code) created by Japanese corporation Denso-Wave in 1994. The "QR" is derived from "Quick Response", as the creator intended the code to allow its contents to be decoded at high speed. QR Codes are common in Japan where they are currently the most popular type of two dimensional code....
QR Codes storing addresses and URLs may appear in magazines, on signs, buses, business cards or just about any object that a user might need information about. A user having a camera phone equipped with the correct reader software can scan the image of the QR Code causing the phone's browser to launch and redirect to the website embedded in the code"
Why am I looking at them? Well as you can see from the entry above, at the moment they are mostly being used in commercial and advertising scenarios, as yet to my knowledge, no one is utilsing their full capabilities in art. The nice thing about creating artworks is that the process is about experimentation and exploration. Something, that is quite a luxury in the commercial world.
The way a user interacts with a qr code is similar to taking a photograph. Its easy to do, and rewarding for the user. Not like trying to type a url on a mobile phone. I am so crap at typing on my phone keypad, I accidentally offend those who send me texts because I don't reply soon enough (or at all).... and I'm not even a ludite! My works are about imbuing handheld mobile experiences with an element of playfulness. And I'm not talking about gaming/ games etc, I'm talking about playfulness that results in delight and a smile.