From Josh Jacob:
QR Journal allows users with an iSight (or iSight compatible) camera to work with QR codes. QR codes are a like 2-dimensional barcodes capable of representing all sorts to data. They are the perfect mechanism for representing URLs as cameras can scan and process them 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.