The Society for Children's Book Writers and Illustrators
    http://www.scbwi.org
    This website is the perfect reference to anyone who's serious about publishing a book or artwork. There is a small membership fee, but its well worth it.

Preditors and Editors
     http://www.anothrealm.com/prededitors
     Want to know who to trust? This site lists every agent and publisher in the business and informs writers who they can trust and who to stay away from

Agent Query
    http://www.agentquery.com
    Agent query is a huge listing of agents, and what they're in the market for, and what they expect for submissions

As I get more web sites, I'll be sure to add them on