QR codes are two dimensional bar codes that carry hidden messages (URL, images, video downloads, etc). These messages are unlocked when people with special software downloaded on their mobile phone take a picture of the QR code. It is a great way to deliver content quickly, integrate offline and online communications, and is extremely intuitive and easy for people to use.
This technology is extremely popular in advanced mobile markets such as Japan, Spain, Germany and the UK. However, it hasn't quite made it's way into the states. In the US, the technology is not as accessible as it is abroad. But it looks like that might be changing in the next couple years. Several mobile carriers have already set their sites on the technology and are exploring selling phones pre-loaded with QR scanners.
Check out the Nextwall and Wellington Zoo for some cool applications.
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