I'm glad to see so many great books here. It was a nice surprise to see Animal Ark listed, as my kids were rabid fans from around ages 3-6. They are very formulaic, but great for animal lovers, and both boys and girls, as the main character is a girl with a boy for a best friend.
Some really fun princess books are the Frog Princess books by ED Baker. They are probably 4th-5th grade level. The Royal Diaries are based on fact and have some nasty parts, but are very well done, as are Carolyn Meyer's Princess books.
Non fiction is a good way to go for kids who read way beyond their years. Soup mentioned biographies: there is a series titled, "Who was_________" written at a 3rd/4th grade level. We have Mozart and have checked out other versions such as Annie Oakley at the library. The print is large and the books are about 100 pages in length.
I just love book talk!
