What are QR Codes?
QR (quick response) Codes are a type of barcode that can be read by your smart phone. To read a QR code on your phone you may have to download an application, but some phones come ready with barcode scanning capability.
QR codes can be used to share all kinds of text-based data, including URLs, contact information, addresses, or directions.
The advantage of using a QR code is that you can get information onto your smart phone quickly and easily.
For more information:
Watch this short video on the CNET Australia website for an introduction to QR codes.
This blog posting at 708 Media has a list of QR Code Readers you can download to your iPhone, Android, Blackberry or Windows Phone 7.