The Simpsons.
Classic television, been around for ages and will be for ages longer. There is more history to the Simpsons legacy than anything on TV today. Kudos for a show that has written over 300 episodes and can STILL be fresh, innovative and funny to this day. Even shows like CSI and House have become repetitive and dull - each show has the same format - they're completely predictable. House: person is normal, suddenly sick, goes to hospital, doctors discuss options, House throws curveball, nobody believes him, they try all the treatments, none work, House has epiphany, tries crazy treatment, patient is fine, the end.
Jeff