Creative Writing for Teens - http://teenwriting.about.com/ You'll have fun learning about writing and language at this site from the knowledgeable guides at About.com.
Grammar Gorillas - http://www.funbrain.com/grammar/index.html Don't let the colorful graphics fool you! This game is tough. Practice identifying parts of speech, and see how many bananas you collect.
Word Confusion - http://www.funbrain.com/whichword/index.html Do you know the difference between eminent and imminent? How about based and baste? Learn about commonly confused words with this game from FunBrain.com.
Scramble-Saurus - http://www.funbrain.com/scramble/index.html Rearrange the letters to spell the answer to a clue. Categories include Endangered Animals, Sports, and Science.
Paradigm Online Writing Assistant - http://owl.english.purdue.edu/ Think of this site as your own personal writing tutor. Get tips on organizing, writing, and revising.
Grammar Bytes - http://www.chompchomp.com/ Brush up on your comma splices and irregular verbs with this interactive grammar review.