It's over the past 4+ years that I stopped watching television. That's right no cable TV for me for over 4 years. What can I say of the experience: 1) The Internet is a replacement [whether that's good or not - it's unclear], 2) I now dislike advertising even more then before, 3) Stopping to watch TV doesn't necessarily make you more healthy or happier, 4) Since world events are a topic of discussion among friends, family and at work - find another source for this information.
There was a recent study mentioned in the Wall Street Journal, plenty of people commented on it and I esp. like this one.