Chats and Forums

Sudoku Forum
A forum for fans as well as people wanting to learn more about Sudoku.
http://forum.ringsworld.com/sudoku.html

Sudoku Players
The sudoku.com forums. Includes discussion on solving techniques, solver programs, downloadable puzzles, sudoku for juniors and the puzzles printed in different newspapers from around the world.
http://www.sudoku.com/forums/

Sudoku Programmers Forum
Discussion forum for developers of programs such as creators, helpers, and solvers. Discussions include solving techniques, creating puzzles, mathematics, and variants.
http://www.setbb.com/phpbb/?mforum=sudoku