Organizations and Institutions
Children's Book Council (CBC)  Insightful articles from CBC Magazine Perspectives
The Society of Children's Book Writers & Illustrators (SCBWI)
SCBWI Western Washington  My local SCBWI chapter rocks.
Highlights Foundation Writing Tips
The Institute of Children's Literature  I took their basic course. 
Wonderful teachers and reference materials.  Here are their Writing Tips.

Magazines
Kid Magazine Writers  Information about children's magazines.
Colossal Directory of Children's Magazine Publishers  Maintains guidelines online.

Themes and Guidelines for selected magazines:  I like writing to a theme.  Just one word can spark several story ideas.  And sometimes I've written a story that fits a theme.
Carus Publishing [Cricket and Cobblestone Group of Magazines]
Highlights for Children
Hopscotch, Boys' Quest and Fun For Kidz Group of Magazines
Pockets Christian magazine

Nonfiction
Fiona Bayrock has a wealth of information on Writing Nonfiction for Kids
Evelyn B. Christiansen has a list of Educational Publishers
Joann Early Macken's List of School and Library Publishers
NTSA's List of Outstanding Science Trade Books
State Curriulum Standards
Repositories of Primary Sources

General
Absolute Write
Fiction Factor

The Business of Writing
Remember to do your homework before you submit your best work.
Agent Query
Book Publishers
CBC Book Publishers
Children's Bookshelf  Subscribe to this free, weekly e-newsletter
Colossal Directory of Children's Book Publishers

Writer, Editor and Librarian Websites loaded with great information
The Purple Crayon  Harold Underdown's extensive set of resources
Cynthia Lietich Smith's website and blog both have a wealth of information
Cheryl Klein talks about crafting books
Linda Sue Park on writing.  Words of wisdom.  Write those two pages each day.
Jane Yolen has the heart and soul of a writer.  She takes joy. 
Randy Ingermanson on Plotting with his Snowflake Method
Sharyn November useful links
New Book Reviews by Esme Raji Codell
Fuse#8 Blog  Book reviews by Betsy Bird

Writing Friends
My dearest writing friends are in my critique group.  Some of them have websites.
Lois, Vijaya, Allyson, Kevan, Molly, Jen (we are celebrating her first book: I'm Nocturnal, How About You?).  Not pictured: Karen (who was sick) and Eileen (who has a new baby).

Peggy King Anderson my first writing teacher.  Our core group formed from her class.
Kevan Atteberry artist and writer with a wicked sense of humor.
Molly Blaisdell she's going to have a huge stack of books one day.
Lois Brandt writes stories with heart.
Jen Heger writes lyrical books.

Along the way, I've made more writing friends.  I've had the pleasure of meeting some of them. 
Below, Fiona and Mel entertain my monkeys with horseplay and stories.

Janeen R. Adil award-winning nonfiction writer
Fiona Bayrock rocks!  Truth is stranger than fiction and she knows how to tell it.
Mel Boring award-winning nonfiction writer
Evelyn B. Christensen mathematician, writer and puzzle creator
Doris Fisher puzzle master.  She's got new books coming out!  Woo-Hoo!
Paula Jolin an amazing and thoughtful new voice.
Christy Lenzi historical fiction
Eric Ode singer-songwriter-poet
Shirley Anne Ramaley writer and photographer
Miranda Roberts silk artist extraordinaire
Barbara Seuling excellent teacher and writer
Shelley Souza thoughtful writer and artist.  See her father's art here.

Discussion Groups
Reading, Writing & Arithmetic  My blog
Non Fiction for Kids  This list is focused on nonfiction for kids.
Verla Kay's Blue Board  A supportive place for children's writers.

Misc. Sites
School Visits State by State