Apparently, these symbols are becoming quite common in Europe and are finding new applications every day. One application might be electronic coupons on packaging or billboards. Snap a picture with your cellphone which has a QR app, of course, and route the credit to your Pay Pal account for your next on-line purchase. Or, forget the note pad and paper; electronically capture a URL, phone number etc that you want to remember by using your phone to snap a picture, decode and store the info. You can easily create you own codes for labeling property or advertising.
Here a few internet QR code generators to play with:
(Thanks to blog Rene Plein Air for the links)