I loved Judy Blume, Beverly Cleary, and Laura Ingalls Wilder. My favorite book of all time, though, was Lois Lowry's Number the Stars. If you haven't read it, its a great story about two little girls living in Copenhagen during WWII. I still re-read my copy every now and then.
The Witch of Blackbird Pond was a favorite, as well. I could relate to Kit, because I often felt out-of-place.