Wikipedia today introduced a program called QRPedia, a QR code creation service that lets users snap a picture of a QR code and be automatically directed to a linked mobile Wikipedia entry in whatever written language their phone uses. If there's no article in their language for the designated topic, the program directs them to the most relevant related article that is available in that language. If you don't have a QR reader on your phone, I use the Google iPhone app, myself.
I dare you to find a cooler example of QR codes in action than QRPedia. Originally built at England's Derby Museum and Gallery (by the museum's Wikipedian in Residence!) the service is now available to anyone online. Multiple museums around the world have already put it to use, posting QR codes on the wall next to items on display. That's what the Internet is for, people, for taking the reality we're standing in front of and exploding it with a world of additional information available on demand.
Full piece at ReadWriteWeb