http://www.syvum.com/english
Practice your spelling, reading, vocabulary and more...

http://www.english-zone.com
Many language arts activities.

http://www.learningplanet.com/index.asp
Interactive games to support language arts.

http://puzzlemaker.school.discovery.com/index.html
Make your own puzzles, word searches, and mazes within minutes.

http://www.hbschool.com/menus/harcourt_brace_spelling.html
Test your spelling knowledge with this spelling challenge.  Suitable for grades 1-6.

http://www.dositey.com
Interactive language arts lessons, games, exercises, printable worksheets, open-ended questions and more...Suitable for grades K-8.

http://www.kids.mysterynet.com
Use your critical thinking skills to solve these online mysteries.