I'm surprised to see only one mention of Heinlein, as I picked up the Rolling Stones in 4th grade and devoured voraciously from then on. My parents kept me age appropriate on Heinlein as long as they could. Most especially, I intend to hand my daughter Podkayne when she's a little older.
I'm also surprised to see Enders Game on the same list. While the characters are young, the themes are a bit more mature than I think my little one could handle until high school. Though I could be misjudging, as I don't recall how old I was when I first read Ender.
Maybe you feel Pern is fantasy, but what about Decision at Doona? McCaffrey was as active in my early SF reading as Heinlein, and far more palatable when I was a child than Asimov.
And Pip and Flinx, which I am redevouring as an adult, would appeal to many children, no?
