International Children's Digital Library:
A Library for the World's Children
Features a multilingual, international collection of children's books, over 4000 titles in 54 languages.
Literature for Children is a collection of the treasures of children's literature published largely in the United States and Great Britain from before 1850 to beyond 1950, from the State University Libraries of Florida.
Children's Literature
Home of the Children's Literature Comprehensive Database, and other resources.
Picturing Books
About picture books. The Picture Book Database is by subscription, but there are also freely available resources, including a glossary and identification of the techniques used by authors and illustrators, with examples.