QR codes in library - Does anyone use them?

Although they were initially intended exclusively for use in shipping industry, Quick Response code is gaining popularity with widespread use of smartphones and has began to be used and implemented in various types of libraries for engaging and assisting patrons. Absolutely free, allow access to more data than standard bar-codes, can be read with almost all types of smartphones and with great potential to bridge the gap between digital and physical objects. Sounds good, but is it? In this paper we will overview current usability and future applications of QR codes in libraries.