Librarian Laura Pressley of Wake Forest University Library has created a nice LibGuide which gives more ideas on how QR codes can be used in other libraries: displays, audio tours, library tours, signage, in the library catalog, and to connect e-resources to the physical stacks.
Be sure to read the Library Success Wiki for more QR Code examples.
Listen to what Wake Forest University Library is doing with QR codes.
QR Codes in Libraries from lauren pressley on Vimeo.
At the New Trier Library our latest display for Women's History Month has been augmented with QR Codes. Using their phones, students can scan the QR codes and find out more about historically important women.