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The American Crossword Puzzle Tournament - the oldest and largest event of its kind. Organizer: Will Shortz; Coordinator: Helene Hovanec
http://www.crosswordtournament.com

Trick Me - Patrick Merrell's blog with puzzles, cartoons, books, and puzzle tidbits
http://trickme.wordpress.com

Triple Play Puzzles - Website for Trip Payne, Wordplay star and author of the acclaimed Crosswords For Kids series
http://www.tripleplaypuzzles.com

Cruciverb.Com - The community center for crossword constructors
http://www.cruciverb.com

The National Puzzlers' League - the world's oldest puzzlers' organization
http://www.puzzlers.org/

Puzzles.com - puzzles and optical illusions, magic and origami, scientific toys and math diversions. Puzzles to play and to buy
http://www.puzzles.com

Conceptis puzzles - number and picture logic puzzles
http://www.conceptispuzzles.com

WonderLetters - an innovative crossword game for children
http://www.wonderchess.com/product.htm

Heirloom Puzzles For Children - Handcrafted, educational wooden puzzles for children at affordable prices http://www.heirloompuzzlesforchildren.com

Peter Puzzle - Creative, innovative puzzles, activities, books, and more by Peter Grabarchuk, a leading puzzle designer http://www.peterpuzzle.com