Kids Only

Fun-4-Children :

[ Kids ] - Poems, riddles, stories, jokes, riddles, and comics written for and by children.
Kid Stories :

[ Kids ] - Created by and for kids. Publish stories online.
KidPub :

[ Kids/Teens ] - Publish a story, read stories written by other kids, and help write the never-ending story. Includes questions and answers, archives, and forum. [Forum requires paid membership to post.]
Kids Bookshelf :

[ Kids ] - Publishes children's stories and drawings as well as class projects. Offers monthly contests and drawings for prizes. Also has children's book reviews.
Kids Haven :

[ Kids ] - Publishes prose and poetry written by kids for kids.
Unschool :

[ Kids/Teens ] - An Australian children's ezine featuring poetry, short stories, pictures, book and movie reviews, games, and articles.
Write Me a Story :

[ Kids ] - Provides a weekly story starter, then randomly selects five pieces to feature on the web.