Many times, gifted students read far above the level where it is easy to find appropriate content. Hopefully this list will help. It is not exhaustive. As a parent or teacher, preview these books to make sure they are approiate for your child's or student's emotional maturity. Teachers can also use these books in the classroom as a literacy circle or as an enrichment for your gifted students. You can also look up "100 great books". Some are appropriate, some are not. Don't forget poetry books.
Historical Fiction: Laura Ingles Wilder books; Witch of Blackbird Pond by Elizabeth Speare; Sign of the Beaver by Elizebeth Speare;
Fiction: The Dark is Rising (3rd in a series, the whole series is interesting); 100 cupboards; Castle in the Attic; Artimus Fowl; Fablehaven series by Mull; Percy Jackson series; Junglebook (unabridged version); Tarzan by Edgar Rice Burroughs (unabridged); Tom Sawyer by Mark Twain (unabridged- kinda hard at first- controversial topics such as slavery); Tuck Everlasting; Journey to the Center of the Earth; 100 dresses; Bridge to Terabitha; On the far side of the mountain
NonFiction: journals by specific organizations such as the National Science Teacher Assiciation (http://www.nsta.org/). It might be for teachers, but it clearly explains what is happening in the world of science.; magazines; newspapers such as Nashville's Retrospect which reruns headline stories from decades past (http://nashvilleretrospect.com/);