One of the most comprehensive grammar and writing guides I've seen. Click on the "Index" in the middle of the page. http://grammar.ccc.commnet.edu/grammar/
How good are you at solving mysteries? http://kids.mysterynet.com/solveit/
Here's a fun game about types of sentences. http://www.harcourtschool.com/activity/clubhouse/index_pre.htm
To find a list of appropriate books for the fourth grade, click here. The list is organized by favorites, independent reading, and nonfiction. Guided Reading levels are shown. (You will need Adobe Reader for this one.) http://teacher.scholastic.com/products/paperbacks/pdfs/Ready-To-Go_Grade_4.pdf
Need Spelling practice? Play these games to practice your spelling words to learn. http://school.elps.k12.mi.us/donley/classrooms/berry/sitton_spelling_activities/4thgrade_spelling/core_word_units.htm
Need practice with proofreading? See if you can beat a score of 200! http://www.eduplace.com/kids/hme/k_5/proofread/proof.htm
Find great power points to teach just about anything. http://www.pppst.com
Thinkquest http://library.thinkquest.org/6297/games.htm
Persuasive Writing Web http://www.readwritethink.org/materials/persuasion_map/
Biographies http://www.mariner.org/educationalad/ageofex/biographies.php
Enchanted Learning http://www.enchantedlearning.com/explorers/1400.shtml
Great Spelling Practice http://www.spellingcity.com
Make your own acrostic poem. This Read, Write, Think site will lead you through the steps of planning, drafting, and publishing an acrostic poem! Enjoy! Make an Acrostic Poem!
Great Spelling Website!