This looks great. One very important application for such a device is for viewer analytics. A lot of companies, e.g. Nielsen, would like to automatically gather

This looks great. One very important application for such a device is for viewer analytics. A lot of companies, e.g. Nielsen, would like to automatically gather data on what you are watching. Now, its relatively easy (well, if you have access to the cable box) to know what channel you are tuned to but they don't know if you actually watching the TV or not. One necessary (but not sufficient) condition for watching is, of course, for the TV to be on, which can be detected by a gadget like this.