For Writers

Writing organizations

Society of Children’s Book Writers and Illustrators (SCBWI)
Canadian Society of  Children’s Authors, Illustrators and Performers (CANSCAIP)

Forums

Books and Writers Community on Compuserve (a forum for writers of all genres)

Blogs

From the Mixed-Up Files (group blog of writers of middle-grade fiction)
Writer Unboxed (group blog with contributors who are bestselling authors and industry leaders)