Just do it.
After Katrina, when we evacuated to my parents' house, they'd just moved in themselves, the day before. We agreed to not hook up cable. My kids calmed down noticeably. No, remarkably. We watch, maybe, a movie or two a week. The DVD player broke, so they only watch those movies on a computer anyway. The TV hasn't been turned on in weeks. I now own a $5000 Ethan Allen box to hide a $500 TV box that I don't use. Just throw the boob tube away. What do you do with a livingroom that has no TV? Feng shui.
My wife has started advising parents of kids with ADHD to get rid of their TVs. They're scared at first, but they do it. And in a few days or weeks they love her for it.
The pediatric neurologists I was with last month think ADHD probably isn't even a legit diagnosis (psychiatric diagnoses are voted on). They very frankly told me they think it's mainly a combination of TV and bad parenting, which is on the rise thanks to TV and entirely too many double-income homes. And if you're questioning their politics, these folks are insanely smart and educated, and probably more liberal than Noam Chomsky, and I know at least one that raised four kids herself.
In case you missed it: throw away the TV. All of them.
For specific readings, go to PubMed's Entrez site and look up the author "Christakis DA". He's prolific, but his biggest newsmakers are some rather large studies showing dose-dependent correlations between TV and obesity, attention deficit, violence at school, and I think there was something else.