To read them
All you need is a mobile phone and a program that can scan QR codes. For most of them you only need to start the app and then point the camera at a QR barcode, and within a very short time you looked up a window that tells you what the barcode containing, with the possibility of going further - open a given site, add a new contact person, etc.
iOS:
QR Reader (App Store, Free)
Also takes care of history and lets you create your own QR codes
i-nigma (App Store, Free)
Also read the "regular" bar codes and check prices at Amazon, etc.
BlackBerry:
QR Code Scanner Pro (Appworld BlackBerry, Free)
BeeTagg QR Reader (Appworld BlackBerry, Free)
ScanLife Barcode Reader (Appworld BlackBerry, Free)
Android:
Barcode Scanner (Android Market, free)
Can also generate QR codes for apps, contacts etc.
i-nigma (Android Market, free)
Same as iOS version above.
You can also read them through Google Goggles, available for both Android and iPhone.
You can download the Google app to iOS 4 here.
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