I love the book lists for kids that our library publishes. There are several versions, including 50 Best Picture Books for Kids, and lists for Babies, Toddlers, Preschoolers, Kindergartners, etc.
This list is 100 Books Every Child Should Hear Before Starting School, and it's full of great titles. I buzzed through it again tonight, and we've done 70% of the list so far. I think we've got a good chance of finishing before Madeline starts school.