I'm writing in to respectfully disagree with the poster below.
In Silicon Valley, the most popular private school for tech executives' kids, the hardest one to get into, is the Waldorf school, where children use no technology whatsoever, not even word processing, and where families are strongly discouraged from ever turning on the TV. A Google executive who sends his kids there was quoted as saying that the way the technology is going, it's going to be effortless to learn, and that kids really need to build their other mental muscles before they encounter it.
http://www.nytimes.com/2011/10/23/technology/at-waldorf-s...
In my own family (and Lord knows we are not Google executives, financially speaking), my 6-year-old is allowed one, count-em one, night per week when he can watch cartoons and play video games, all done on a standard-issue laptop. He reads at a 4th-grade level. I do not think this is a coincidence.
I suspect that just about everyone will be responding with the opposite point of view, but I wanted to get this perspective out there.