Some other puzzle sites:

• Leicestershire Dyslexia Association
  Free wordsearches to print or play online.
• pzzls
  Pzzls, puzzles, riddles and brainteasers to excercise your brain!
• Sudoku
  The site gives free daily Sudoku and information and forum. The site has an excellent newsletter, which is very popular.
• Car Games
  This site suggested by Dakota Lowe has a wide variety of games suitable for kids in the car--or at home, too.
• fit brains
  This site suggested by Conor Bracknell has lots of riddles and brain teasers.
• Brain Games
  This site also suggested by Conor Bracknell has lots of memory games.
• Focus Clinics
  This third site suggested by Conor Bracknell has a fun Christmas brain teaser.