PCW: If you've gone shopping for a new PC or HDTV, you've probably seen a dizzying array of display-technology terms bandied about in the fine-print specs listings on store shelves. You may have asked yourself, "What do these terms mean? Does any of it really matter?" We hear you. Here's our no-nonsense guide to what these specs mean, what you need to know about them, and what you should be looking out for.