Contests

Brainy Flix
Brainy Pics Contest as part of SAT vocabulary word preparation. Brainy Flix Video Contest as part of SAT vocabulary word preparation.
Sometimes money and prizes are given.
http://www.brainyflix.com/

  
Quiddler: The Short Word Game
Combine letters into words. Contest begins in August and runs through May.
http://www.setgame.com/quiddler/puzzle_frame.htm