By David A. Graham and Leigh Bond
Nothing lasts forever--but some treasured brands make it pretty far. Still, the day comes when even they just don't fit in anymore: Maybe they're looking a little gray, perhaps people no longer look on them as favorably as they once did, or possibly there's an extra dollar to be made by doing an extreme--or not so extreme--makeover. In any case, it's nothing that a little update can't fix. Here's a look at how some of America's most famous logos and pitchmen and -women have adapted to changing times.