RFIDs appeared on the scene a few years ago and seemed to promise a wide range of possibilities, but little has appeared to date. Now ESOMAR's Research World magazine has announced that Mediamark has is using RFIDs in waiting rooms to measure magazine readership. More information is available on Mediamark's website.
I suspect that RFIDs will have a major part in research in the future. They will be an essential part of passive tracking schemes, adding to the enormous amount of electronic wake that will be created for all of us. However, RFIDs will create a number of ethical concerns, as will their joint potential for research and marketing.