Geocaching with QR codes

There just has to be a new angle on geocaching using QR codes. One user has suggested that instead of leaving 'treasure' articles in containers there could be a QR tag from which you are able to access some form of on-line 'treasure'. Maybe we could make a Q-Action page where people can sign in, instead of a physical log book that is subject to vandalism and the elements. The hunt is on.