NFC

Well, no sooner do folks in the library start using QR codes than
the latest thing becomes NFC.
With respect to folks using QR codes...

"If you haven't, you probably never will. That technology, QR Codes, is on its way out. It's going to be replaced by near-field communication chips that ship with phones and provide a much easier way to accomplish many of the same tasks." .... "Indication of the change comes from Google, which quietly phased out support for QR Codes from its Google Places service earlier this week. When Places launched, businesses could put a sign with a QR code in their front window. Passersby could scan the sign and their mobile browser would launch the Google Places page for the business, with information like reviews and special offers."