Tic-Tac-Toe

Guy Fawkes's Analysis of Boolean Tic-Tac-Toe - Analysis of variant that allows anti-play.
The History of Noughts and Crosses - Article on the game's history.
Math Lair - Tic-Tac-Toe - Game variations, looking from the mathematical side
Pencil & Paper Games Plaza: Tic Tac Toe - Instructions for game play.
Tic Tac Toe In Brief - Rules, variations, strategy, theory and practice. Includes an online version of the game.
Tic Tac Toe Strategy Solutions - Details a step-by-step process that allows the first player to win or draw, but never lose.
Tic Tac Toe Top Secret - Description of a strategy against a member of the group that allows one to win or to draw.
Tic-Tac-Toe Strategy - Features explanations and the opportunity to put the advice into practice.