qr code

Hey, just wondering if anyone has messed with zxing (google) or any comparable qr code software. Ive seen a video of someone using zxing in windows w/ processing as a fiducial tracker with metadata built into the qr code. Zxing is written in the java environment and I don't know enough about it to really know if there are implementation possibilities, but was thinking that it would be cool to see a qr code tracker in Quartz or even a qr code decoder.

What are your all's thoughts?