Alan Cooper’s All About Homonyms - Large collection of English homonyms (words that sound the same but are spelled differently).
Education World Word Games Online - Over a 100 links to sites with word games from crossword puzzles to anagrams, etc.
Fake Out - Choose a word and try to guess its definition. Words grouped by age and ability levels.

Free Rice ...For each answer you get right, they donate 10 grains of rice to help end hunger...

Greek and Latin roots...Reading strategies for decoding the meaning of words...

Howjsay.com (as in, “How do you say…”) is a free online pronunciation dictionary. Just type in a word and listen to its pronunciation. It’s ideal for students tackling a difficult reading assignment, and at the very least is much easier than the hieroglyphic pronunciation guide in written dictionaries. Now you can finally hear those unpronounceable terms from biology in English.

INTERACTIVE WORD GAMES - Play against the clock to test your word knowledge.
quizhub - Matching Quiz: SAT Vocabulary

Most Often Misspelled Words in English ...

The Podcast for Word Lovers ...offers a "word root every day" in podcast and text form. Each entry tells at least one interesting story about the word of the day. Past words are available in an archive, as well.

Quizlet is an online application that creates vocabulary lists from topics you suggest. - it aims to make learning fun, thus make learning effective.
Scripps Howard National Spelling Bee - Visit Carolyn’s Corner to explore word elements, complete word puzzles, answer questions posed by an etymology expert, learn various ways to study, and more. Practice spelling with the 2001 Audio Paideia. You will also find a calendar, a listing of ...

Spelling Bee (Grades ALL)...Listen to three stories, one at a time, and then spell words from each story.

New SpellTube is an interesting resource for teaching and learning to spell. Tom Barrett included Spell Tube in his recent post about video resources for spelling, maths, and science. SpellTube provides spelling lessons in the form of videos that feature child actors explaining spelling concepts and rules.
The Fun Channel Word Games: - Gaggle Internet Anagram Server Crambo word search Merriam-Webster’s Word Puzzles Scrabble Home Page, Stinky Pinky Thunk.com Tongue Twister Database Word Scramble

NEW Weboword is a fun little website designed to help students learn new vocabulary words. Each of the vocabulary words on Weboword have cartoon drawings depicting the meaning of that word. Students are encouraged to submit their own drawings to Weboword. Weboword also offers crossword puzzles for students to try...best suited to use in a middle school or high school setting.

Word Lab - a teaching tool that accelerates and improves vocabulary acquisition from literature. It allows students to be self-managers while differentiating the instruction and providing teachers with the data and time to provide individualized instruction when needed

Word Central Here, youngsters can get a leg up on building their own vocabulary while having fun.
Word Spy - devoted to recently coined words, existing words that have enjoyed a recent renaissance, and older words that are being used in new ways.