Battle of the Book List http://www.webrary.org/kids/jbibbob4-6.html
Vocabulary building activities http://www.freerice.com
Learn about our fifty United States. http://www.50states.com
Grammar games galore! http://www.funbrain.com/
The Center for Gifted At National-Louis University http://ww.centerforgifted.org/
ISAT practice tests. http://testpilot.isbe.net/ISBE/index.html
Illinois Association for Gifted Children http://www.iagcgifted.org/
Museum of Science and Industry http://www.msichicago.org/
Grammar games http://visl.sdu.dk/visl/en/edutainment/games/wordfall.php
Metropolitan Museum of Art - check out museum kids for interactive games http://www.metmuseum.org/explore/museumkids.htm
Dallas Symphony Orchestra for Kids http://www.dsokids.com/
Here's a fun and helpful way to build your vocabulary. http://www.freerice.com/index.php