2003 Writers Digest Children's Writers and Illustrators Market   (This is the book Children's writers tend to swear by -- provides tips and articles and mainly names and addresses of publishers, with writers guides and descriptions of what they publish.  This is the Amazon link.)

The Complete Idiot's Guide to Publishing Children's Books (Amazon link; a recommended text)

Colossal Directory of Children's Publishers (great on line resource for writing children's stories)

Write4Kids  (another nice on line resource)

Article: Hans Wilhelm's "So you Want to be a Childrens Book Author" (seems to be a good basic article with a couple of web links)

Article:  Sandra Cook's "Step-by-Step Guide to Finding the Right Publisher"
 (good article)

Society of Children's Book Writers and Illustrators (Hawaii) (I couldn't access the main site, so this is the best I've come up with.  The next link is to the main site.  See if it works.)

Society of Children's Book Writers and Illustrators