QR codes in libraries

I am very interested in the potential these offer to libraries: see this article for lots of interesting ways they can be used: http://qrinlibs.blogspot.com/2011/05/qr-codes-and-mobile-libguides.html

and here: http://qrinlibs.blogspot.com/

I really like this poster:

LibGuides

http://www.springshare.com/libguides/

These seem an excellent way of sharing info and knowledge.....