Puzzle / Sudoku Links - Logic Masters India

Argio-Logic - Weekly Sudoku Competition
Croco Puzzle - Daily puzzle contests
Fed Sudoku - Daily and Weekly Sudoku Competition
For Smarts - Lot of puzzles, and occasional contests
Janko.at - Exhaustive list of online puzzles
Hungarian Logic Puzzles by Horvath Zoltan - Lots of downloadable Puzzles
Roland Voigt's Skyscraper Puzzle Page - Interesting puzzle types posted every week
Tim's World of Puzzles - Lot of downloadable puzzles
Nikoli
PuzzleFountain - by Alberto Fabris - Regular Puzzle Competitions
PuzzleMix - by Dr Gareth Moore - Online Puzzles
Puzzle Picnic - A must place for all puzzlers
Russian Puzzle Club - Frequent Competitions
Sudoku Variants - By Uwe Wiedemann
Sudoku Cup - Weekly Sudoku variants and quarterly Sudoku Contests
Sudoku.it - Online Sudoku
The Griddle by David Millar - Lot of downlodable puzzles with cool designs
World Class Puzzle from The Netherlands - Very high quality puzzles published everyday