Blue Web'n: An online library of 1200+ Internet sites categorized by subject, grade level and format. Provides ideas for lessons plans, activities, projects
Kathy Schrock's Guide for Educators: Lesson plans, science fair ideas, bulletin board ideas, webquest information, slide shows for teaching, and much more
Thinkfinity : Free educational resources, activities and lesson plans
Rubistar: A free tool to help teachers create quality rubrics
Teach-nology: Lesson plans, worksheets, rubrics, teaching tips
The Educator's Reference Desk : Lesson plans by subject
Shmoop Quizzes, assignments, lessons