Sooner Boomer asks: "Not having met 'Mrs. Boomer' yet, I'm buying Christmas gifts for my nieces and nephews. Whether genetics or just good luck, almost all of the young 'uns are girls. I've been slowly introducing them to the classics of science fiction: Heinlein ('Podkayne of Mars', _'Starship Troopers', etc.), Asimov short stories, Ann McAffrey (the Dragonrider books), Alan Dean Foster (the Flynx books and others), Douglas Adams and Terry Prachett, some Neil Gaiman (Stardust, Good Omens), as well as the mandatory Tolkien and C.S. Lewis. This is just a partial list, but what would Slashdot consider to be good (or even essential) science fiction for teen and pre-teen girls?"