Is there a QR-Code reader application for Mac OS X? I'm using Mac OS X 10.6 and an iSight.
No free app that I'm aware of, but for a few dollars/euro you can download QuickMark from the Mac App Store, here's the link
I just discovered QR Journal, which works fine for me. The latest version requires OS X 10.8/10.9 but there is a legacy version available which works with 10.6.
Now desktop users with an iSight (or iSight compatible) camera can read QR codes. Found a QR code in a magazine or catalog? Simply hold up to the iSight camera to scan, store and browse to. Received a QR code in an email? Just drag it into QR Journal to read it.