About.com's Homework Helper: Find a personal tutor, subject links, and reference sites. Grades 8-12.

AOL@School: Find current events information, reference materials and teacher links. Grades K-12

Big Chalk: Find tutors, Q&A, & subject specific links. Grades 3-12

DiscoverySchool.com: Find great activities, subject links, & reference materials. Grades 3-12

Educational Resources: Subject specific quizzes, games, activities and links. Grades K-12

Encarta: Extensive subject specific web sites. Includes reference materials and study tips. Grades 4-college.

Fact Monster: Reference materials, lessons, subject links, games and quizzes. Grades 2-7

Homeworkhelp.com: This site charges a fee, but includes homework help, test prep, study tips, and extensive subject specific materials. Grades 6-12

Lightspans Homework Zone: Q&A links, grade and subject specific links, lessons and reference materials. Grades K-6

Dr. Math: Math Q&A & math forum archive. Grades 4-12

Tutor.com: Find personalized, live tutoring help. Grades 2-college.