Saturday morning cartoons are the big one for me.
My mom took the approach of just reading out loud whatever she read, so I grew up with Lord of the Rings and other good solid books. I personally read Madliene L'engle's books in 3rd and 4th grade then skipped directly up the ladder to Dune (making me the only 9 year old I've ever met that managed to make it through Dune Messiah (and man did I ever manage to miss the subtext and analogy and etc)) .
But cartoons, man I loved em all. Tried to watch GI Joe and Transformers a couple years back and could barely last an episode.