A few blog readings and a quick surf later, and I'm totally converted. They are amazingly simple to generate, and have the most incredible applications to marketing services and collections in a public library.
Creating a QR code for display is as simple as 1, 2, 3. QR code generator searches on the web reveal plenty of places to do the work, and this one is really simple, and the first I tried.
Finding advice and suggestions for their use wasn't difficult either - just search for QR codes in libraries, to access blog posts, prezis and slide shares on the topic. Thedaringlibrarian got me started and now there's just no looking back.
If you don't have a smart phone to do the decoding for you, the QR code shown will take you to Eric Whitacre's TED Talks video clip of the making of his virtual choir. The full version of the song is now out, too, and can be listened to here.