Into the Book: Reading Strategies - interactive for students, lessons and resources for teachers
Teacher Book Wizard: Type in a book title and it will tell you the reading level
Read Write Think: Reading and writing lessons, resources and student interactive lessons
Wacky Web Tales: Interactive "mad libs" for students
Writing Fix - 6+1 Traits: Lessons and ideas on 6-trait writing
Spelling City: Students can type in their spelling words and the student can learn their word lists using learning activities.
A Maths Dictionary for Kids: Math Dictionary for Kids with interactive and animated dictionary of math vocabulary words from a to z
Math Wire:standards-based math activites and printable games
RubiStar: Free rubric maker
Teacher's Clubhouse: all subjects for easy download of worksheets and activities that mostly cost 99cents
Teachers pay Teachers: This site has a lot of awesome material, unfortunately you might have to pay for some of the items.
Laura Chandler: If you sign up for her newsletter, you will receive different materials each month
Melissa Forney: Has a lot of fun and amazing writing materials
Sanchez Class: Graphic Organizers, manipulatives, poster and other materials
Real Classroom Ideas: A little bit of everything
DOGO News: Short current event articles on students reading level
GCSE Bitesize: UK education site for teachers and students
National Geographic: Photos, articles, information, quizes to spur interest
National Geographic Education: Mainly for Teachers
Government Document Archives: Archive of historical documents
Discovery Education: Science lesson plan ideas
Teachers' Domain: Great animations to help explain science concepts
Teaching Degree: List of useful websites
Arcademic Skill Builders: Improves math skills
Super Teacher Worksheets: Multiplication worksheets and games