Per an article from Chad Jenkins and Chris Forbes entitled "QR Codes and smartphones make for smart ministry" (April 2011 - page 19):

• www.christianexaminer.com/Articles/Articles%20Apr11/Art_Apr11_12.html

Here are some links to check out:

• delivr.com/qr-code-generator
• zxing.appspot.com/generator
• qrcode.kaywa.com
• keremerkan.net/qr-code-and-2d-code-generator

Smartphone users should check out: ZXing, BeeTag, ScanLife, and i-nigma