Absolute Write
A terrific message board full of answers to questions you never thought to ask.

Agent Query
Inventive and exhaustive searchable database of agents.

Alice Pope’s Children’s Writers & Illustrators Market blog
Alice is the editor of Writer’s Digest Books’ Children’s Writers and Illustrator’s Market and knows the field like nobody’s business.

Cynthia Leitich Smith’s Children’s & YA Literature Resources
Full of fabulous interviews with agents, editors, and writers from a children’s books writer herself.

Goodreads
Best place to write reviews and share recommendations of books with friends.

Guide to Literary Agents Blog
Chuck Sambuchino’s companion blog to his terrific resource, featuring interviews with writers on how they’re landed agents, as well as industry professionals.

Query Tracker
Another great database tool to help writers track their submissions to agents.

SCBWI
The Society of Children’s Books Writers and Illustrators is the first and best support and information sharing group for creators of children’s books.

The Verla Kay Blue Boards
Message boards for children’s writers and illustrators where they can trade rumors and tips with each other.