Just bumped into zxing project, and wanted to share.

According the Project Home page:

ZXing (pronounced “zebra crossing”) is an open-source, multi-format 1D/2D barcode image processing library implemented in Java. Our focus is on using the built-in camera on mobile phones to photograph and decode barcodes on the device, without communicating with a server. We currently have production-quality support for:

• UPC-A and UPC-E
• EAN-8 and EAN-13
• Code 39
• Code 128
• QR Code

Now I have to think of an implementation that will use QR Codes…