We've linked to other Lowell Monke articles in the past. Here's a link to his first article in Orion. Worth considering.
Computers not only divert students from recess and other unstructured experiences, but also replace those authentic experiences with virtual ones. According to surveys by the Kaiser Family Foundation and others, school-age children spend, on average, around five hours a day in front of screens for recreational purposes. All that screen time is supplemented by the hundreds of impressive computer projects now taking place in schools. Yet these projects—the steady diet of virtual trips to the Antarctic, virtual climbs to the summit of Mount Everest, and trips into cyber-orbit that represent one technological high after another—generate only vicarious thrills. The student doesn’t actually soar above the Earth, doesn’t trek across icy terrain, doesn’t climb a mountain. Increasingly, she isn’t even allowed to climb to the top of the jungle gym.