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http://howto.wired.com/wiki/Read_a_Barcode

Read a Barcode

From Wired How-To Wiki Why are barcodes so cryptic?
Introduction to barcodes

QR Codes Explained

http://www.qrme.co.uk/qr-codes-explained.html
http://code.google.com/p/iphone-qrcode/ QRCodes are two dimensional bar codes very popular in Japan.

iphone-qrcode - Project Hosting on Google Code