Think of all the devices we carry that snatch signal out of the air or intercept it as it streams past over cable of some kind or another. Think of all the possible sources of signal â€” not merely network and cable but Youtube and iTunes and a million more as broadband broadens. A device like TiVo used to seem remarkable: sitting at home, watching television all day long, saving what we asked it to save or what it thought we might like to have saved. But there is no such thing as cosmic TiVo, dialed in to all the signals that pass through our lives, coordinating and saving Web sources and air sources and cable sources and personal sources, like home videos and digital photos. We ourselves are the tuner in the television set, modulating all these inputs, carrying them to the new flat-screen panel for viewing, one by one. The idea of sitting down in front of â€œthe televisionâ€ and watching â€œwhatâ€™s onâ€ seems almost romantically archaic. Until you try it. Then it just seems archaic.