Google recently sent out 100,000 stickers to selected US businesses for use on their storefront windows. The stickers have the Google Maps logo and a QR (Quick Reference) code that can be scanned by smart phone cameras and display Google listings for the business on the phone screen.
A camera is often included in mobile phones, portable gaming devices and PDAs, so rather than laboriously copy down the details, these 2D bar codes provide a quick way to transfer simple information.
You can generate your own bar codes at the QR-Code Generator website. To read them, you’ll need an application linked to your camera. Try search your ‘phone’s application store, or take a look on google for QR Code reader
Is there such a thing as a desktop reader for QR codes?
Sometimes QR Codes have a number underneath which you can use to decode them without a camera but you can download a free desktop reader called icandy. You’ll still need to get the QR Code image onto your computer, perhaps with a scanner or digital camera.
.Net client library for decoding and encoding QR Codes
http://twit88.com/platform/projects/show/mt-qrcode
PHP QR Code Generator
http://keremerkan.net/php-qr-code-generator/
C library QR Code Generator
http://megaui.net/fukuchi/works/qrencode/index.en.html
Nice and simple explanation. QR codes let people quickly and easily visit a certain page on your website. I learned here: http://www.coreldraw.com/en/pages/qr-code/index.html how to create QR code and I find QR codes very useful