I used http://delivr.com/qr-code-generator to create a QR code for my Library home page.
(I was impressed with the advice given on this qr code generator site on what size QR code you needed if you were going to use it on a billboard!)
My husband has a Neoreader app on his android phone and we used this to scan my QR code.
We also scanned a QR code on a planning application notice on a lamp post. The scanned QR code took us to the specific detailed planning application on the Local Authority planning database.
The URLs for e-books are usually quite long; in the Health Services Library we used QR codes to link to the login for specific e-books.
caterpillarlizzie 