Some that have been hits here as read-alouds:
Ronia the Robber's Daughter - Astrid Lindgren
everything else by Astrid Lindgren
Tove Jansson's Moomin books
The Secret Garden - Frances Hodgson Burnett
A Little Princess - Frances Hodgson Burnett
The Silver Crown - Robert C. O'Brien
Mrs. Frisby and the Rats of NIMH - Robert C. O'Brien
Coraline - Neil Gaiman
The Green Book - Jill Paton Walsh
Nim's Island - Wendy Orr
The Egypt Game - Zilpha Keatley Snyder
The Wind Boy - Ethel Cook Eliot
Understood Betsy - Dorothy Canfield
books by Eleanor Estes
books by Beverly Cleary
the Harry Potter Series
Cornelia Funke's Inkworld series
the May Bird series - Jodi Lynn Anderson
The Mysterious Benedict Society series - Trenton Lee Stewart
the Silverwing series - Kenneth Oppel
the Little House series - Laura Ingalls Wilder
the Swallows and Amazons series - Arthur Ransome
Oh, and my DD (almost 9) loves the Bone graphic novels by Jeff Smith. She also loved Zita the Space Girl, another graphic novel, by Ben Hatke.
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