AplusMath
Interactive math resources for teachers, parents, and students featuring free math worksheets, math games, math flashcards, and more.
Encyclopedia Britannica
Encyclopedias are still around and they offer as much information as always...but now it's all online.
Fact Monster
Lots of homework help with history and geography, plus interactive games and brain quizzes
Funbrain
Brain games of every description, plus access to books and videos galore
Homework Spot
A data base of educational resources from elementary to high school, plus resources for parents and teachers