German readers should probably revisit the TKKG novels for a particular disappointing experience.
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.
On the other hand, the Chuck Jones and Tex Avery cartoons have held up quite well, probably because the creators were doing them for themselves as well as younger kids.
The main thing I remember from those books was the feeling that I had a deprived childhood because I didn't grow up in a junkyard. (Nor have a chauffer on call, but the lack of a junkyard was the main thing I really felt.)
What I find impossible to play today are early 3D games. So much time and effort was spent trying to make the games look cool and flashy at the cost of gameplay, and it was when most devs really didn't even know how to make a 3D game. Most first-year PS1 and N64 games are examples of this.
I think this is because good gameplay doesn't age as quickly or as harshly as good graphics. Graphics have improved greatly, while gameplay hasn't come quite so far.