ISLMC maintained by the Internet School Library Media Center's Children's Literature & Language Arts Resources is a comprehensive resource for language-arts-related topics.
Jan Brett's Homepage contains an amazing amount of resources for teachers and students; a good author index site can be found here.
Literary Criticism provided by the Internet Public Library has the best starting point for literary criticism.
Myth Search is dedicated to making your search for myths, legends, folklore and religions both past and present easier and more enjoyable.
New York Times Book Reviews is a great book review starting point; the NYT Book Review section is searchable back to 1980.