How could I have forgot Beatrix Potter! You are so right Calming Tea.

These may be a little on the younger side, but I love, love love the following:

Little House on the Prairie Books

Thornton Burgess Books (especially Grannie Fox ;-)

The Secret Garden (a must if you have a girl)
A Wrinkle in Time
The Chronicles of Narnia (entire series)
Tom Sawyer
Little House on the Prairie (series)
Little Women
Aesop's Fables
From the Mixed-Up Files of Mrs. Basil E. Frankweiler (More of a contemporary classic. 3rd on up will love it; I still do!)
Children's Illustrated Bible
A Christmas Carol