We did not allow either child any screen time until age 2.5. They were then give the opportunity to watch TV or use a computer for about 30 minutes per day a few times a week. They are now 10 and 6 and do not watch any TV at all on an average day; they might get 2-3 hours in a week, typically none on school nights. They must earn play time on computing devices by doing some sort of "work" first, which might be homework (if they have some) or educational programs like Dreambox.
I wouldn't worry about developing familiarity with technology. Today's technology is often so intuitive a monkey could learn to use it.
