Grade+K-3+Language+Arts

Spelling

 * Spelling game http://www.theproblemsite.com/junior/spelling.asp

Reading

 * Book Adventure http://www.bookadventure.org/
 * Booklist http://school.familyeducation.com/summer/reading/38769.html

Writing

 * Stone Soup Writing by Children http://www.stonesoup.com/writing-by-children/
 * Kids Pub http://www.kidpub.com/