I ran across a post in Google's official blog about their literacy project. It seems to be promoting something called World Book Day, but it's unclear to me when that actually takes place. Several worthwhile partner projects/organizations are listed, and a couple caught my eye. Specifically, materials from CAST and the Digital Hero Book project like they were worth checking out further.
Post here if you have experience or knowledge of the groups mentioned in this pages on literacy!
For teachers looking for children's books from around the world I would like to recommend the International Children's Digital Library. It is a free resource with over 1300 titles.