AskOxford: Word Games
Explains the history, shows variations, and provides resources pertaining to word games.
Blackdog 4 Kids: Word Games
Offers a wide variety of word games for kids. Includes word search, hangman, crossword puzzles, anagrams, Joggle and a pig Latin converter.
Mattel Scrabble for Kids
Features Shockwave based games for kids. Play Scrabble Snake, Scrabble Hangman or Zap the Letters.