Sudoku Links
Here are some useful Sudoku links:
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Astraware's Discussion Forum for PDA software including the handheld Sudoku solver for Palm and Pocket PC. | 
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SadMan Software's Sudoku - Some great descriptions of techniques, and a good PC based program to make solving puzzles a bit faster. |
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Simple Sudoku - another great PC based maker and solver. |
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Sudoku Susser - a powerful assistant with Mac and Linux versions available. |
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Sudoku Wikipedia Entry - some good background info |
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Sudoku.com Forum - for more general discussion. |
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The Sudoku Programmer's Forum - a bit extreme but really in-depth discussion on techniques. |
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Sudoku League - enter online Sudoku competitions. |