D.J.
I still haven't let my 2-year-old watch TV, and I'm totally happy with it. He is curious, intelligent, and active, and totally independent of the television for his amusement. I do not plan to ever let TV become an integral part of his life.
I believe (don't quote me) that there was a study a while ago showing that "educational" TV for kids is pretty much useless - they don't learn like adults do, and they need to be feeling and touching and experiencing things to learn from them - not just passively receiving them from the television. Your little ones will be much better served by personal interaction with you, with pets, with toys, etc. And besides, do you really want kids stuck on TV? What does it lead to eventually, anyway? Sluggishness, dullness of mind, inactivity, obesity, a lack of outside activities, cultural brainwashing, "gimmes" from watching ads, etc. TV does not need to be part of any child's normal development.