Other
Cincinnati Public Library: Kidspace: Online Storytime
Here, you will find several links to online picture books.
Other
Society of Children's Book Writers and Illustrators
This is the Society of Children's Book Writers and Illustrators homepage. A great starting point for new writers interested in exploring this genre.
Harold D. Underdown
Getting Out of the Art File: Tips for Book Illustrators
An excellent resource for illustrators to format their work in order to get the attention of a publisher. Intended for children's literature, but may also apply to other genres.
Other
Picture Book
This website provides resources for the illustrators and publishers of children's books. Here, fans of children's books can view several art portfolios and artists can create and manage their own online galleries.