I just noticed that the LISWire features this story:
QR Codes and More Featured in Reference Renaissance 2010 Program. We just started using a QR Code on our monthly computer class calendar.
I don't know everything about them, like just how small a QR Code can be and still function, but the one I have works fine.
The code is on the back of our monthly computer class calendar where the class descriptions reside, so if you get the image in your camera, the application should take you to our web page for all of our computer training throughout our library system. I think it's pretty cool.
I'm waiting for a confused patron to ask me what "those dots are for" and if he connects them, will he see a picture of a sailboat.
Here is what the code looks like on the document: link.