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An article by Seth Stevenson offering a brief overview of Sudoku.
www.slate.com
Includes an overview of how Sudoku is solved, a monthly contest and a downloadable Sudoku game. Also includes a kids section and discussion forums.
www.sudoku.com
Includes Sudoku tips and strategies as well as a downloadable game and a 3D Sudoku puzzle.
www.sudoku.org.uk
An encyclopedia entry describing the rules, history, strategies and variants of Sudoku. Notes that these are a type of "latin square" which have been analyzed since ancient times.
en.wikipedia.org
Offers a number of applications and solvers for a variety of platforms. Also offers custom puzzles.
www.mathsisfun.net
Article on the puzzle's popularity in the United Kingdom and elsewhere.
www.economist.com
The Guardian: Sudoku fever grips UK newspaper readers
By Stephen Brook. Article covers how the UK craze got started.
media.guardian.co.uk
A project collecting Sudoku with the smallest number of givens that are still uniquely solvable. Offers the puzzle for download in text format.
www.csse.uwa.edu.au
Information on UK-based cellular provider's world-record largest Sudoku puzzle and accompanying contest.
www.skyone.co.uk
BBC News: The puzzling popularity of Su Doku
Article by Paula Dear. Covers history in Japan and the UK and compares to the Rubik's cube craze of the 80s.
news.bbc.co.uk
The Guardian: So you thought Sudoku came from the Land of the Rising Sun...
Article by David Smith covering the puzzle's origins as "Number Place" by Dell Puzzle Magazine in New York in the 1970s.
observer.guardian.co.uk
Offers a tutorial for creating puzzles, a Java-based solver, and links to other resources. [English/Japanese]
www.pro.or.jp
Free daily printable Sudokus. Also offers history, rules, and solving techniques. [English/Spanish/French/Catalan/German/Portuguese]
www.sudokusweb.com
Offers printable grids and solution walkthroughs.
www.sudokuaddict.com
Several programs in different languages for analyzing possible Sudoku combinations.
www.shef.ac.uk