Researchers at Google have been talking up work on linking search engines with audio information. This might, for example, involve your PC listening on a TV programme being watched, identifying it and then presenting tailored search results such as the IMDB entry of a film or the website of the star currently on screen.
Analysts aren't convinced this technology will result in a finished commercial product but the idea that a PC knows what point you are in a film and offering the car or even domestic appliance that features in that scene for sale is either incredibly interesting or quite scary depending on your viewpoint.
