Library of Congress American Memory
A digital record of American history

Khan Academy
Amazing math tutorials to show you how to solve all your math problems

Bibme
A citation creator to help you create a bibliography with ease

NASA
The explorers guide to the solar system

Academy of Achievement
Discover a role model for every career

Carnegie Library Homework Help
More for little kids but it does cover middle school

Learning Express
Practice tests for all levels

Lexile
Find books at a specific reading level

Refdesk
A collection of sites to go to for homework help

Shmoop
Great for history and literature

Son of Citation Machine
Great site for formatting citations

Study Stack
Lots of study skill tools like flashcards

Wolfram Alpha Computational Knowledge Engine
Answer questions; do math; instantly get facts, calculators, unit conversions, and real-time quantitative data and statistics; create plots and visualizations; and access vast scientific, technical, chemical, medical, health, business, financial, weather, geographic, dictionary, calendar, reference, and general knowledge - and much more.