You've read about QR codes before, and even about their 3D implementations capable of storing up to 1.8 Mb of data. Mike Fiorella from Japan Marketing News points to this article that says that "fast food brands are now printing these codes on sandwich wrappers. One quick scan and you're instantaneously provided with nutritional and/or ingredient information. As you'd expect, QR codes increasingly appear on packaged goods too." Most of the cell phones in Japan now come preinstalled with appropriate software.
You can create your very own QR code using this handy generator. If you had a QR-capable phone, you'd know that the code above says, "Read AdverLab to get a clear view of the advertising future."
-- thanks, Mike