If most of the video you watch comes from your satellite dish(es) and/or from so-called “set-top boxes” of some kind (why they are still referred to as “set-top boxes”, when there is no practical way you could set them on top of a modern flat-screen TV, I have no idea), and especially if most of what you watch is high definition content, you should definitely read and use the advice contained in this article:
And when you are shopping for a new HDTV set, make sure it has a way to disable overscan before you buy it. I would not give you 50 cents for a brand new HDTV if it does not have a way to disable overscan. Well, maybe I would give 50 cents, but only to give it as a gift to someone I don’t care about very much. Why a very few manufacturers still don’t include a way to disable it is beyond me.