Eduplace.com- play "Mad Lib" and "Balderdash" games. Read kids' reviews of good books... even write your own & maybe see it online! (grades 2 & up)
Trelease-On-Reading - A wonderful resource by noted expert Jim Trelease for parents & teachers describing children's books by content at all reading levels. Especially geared for encouraging families to read aloud together! Highly recommended!
Lexile Framework- Interested in learning more about the "lexile" score you receive from the SRI computer test in school? Want to find the "lexile" level for a book you're reading? Go here...
Math
Houghton Mifflin - math series for grades K-2. This site contains test practice & challenge games for kids, and tips for parents.
McGraw-Hill- math series for grades 3-5. Includes games & worksheets specific to each chapter. Also has timed math fact drills & links to more fun math sites.
FunBrain.com - math fact games & quizzes... Try "Math Brain." Enter in your grade level to play "arcade games." SOOOO fun!
AAA Math- explanations and games at all grade levels.
A+ Math- math fact flashcards, games, worksheets, etc. at all grade levels.
Science
Space Place - check out this site from NASA and JPL and learn all about different space topics, make some spacey things, solve an extraterrestrial riddle, and dive below the surface of Mars!
SanDiegoZoo.org - Watch the brand new baby elephant, pandas, apes and polar bears LIVE on the zoo's web site!
Harcourt Brace/ Smithsonian- Put in your grade level to see Smithsonian Museum projects & experiments that match the topics you're learning about in science.
USA Today Weather- get today's weather all over the US. Also includes interesting weather trivia and information.