Nonosweeper - Play Minesweeper with Nonograms

Nonograms at Wikipedia

Steven Simpson's Nonograms page - Excellent site exploring the maths and theory of Nonograms

Daily Nonograms to play online at Puzzle Madness

Conceptis Logic Puzzles - Leading supplier of Nonograms and other logic puzzles to publishers worldwide

The Puzzle Museum Griddlers Page - Introduction to and history of Griddlers

Potty Puzzles Pic-a-Pix - Nonogram puzzles made of wooden blocks

Online Nonogram Solver at Griddler.co.uk

Free Nonograms to print from Picross.co.uk

Puzzle sites

BrainBashers - Huge library of puzzles and brain teasers
Puzzles.com - Big site with all kinds of puzzles
Puzzlemakers - creators of a wide variety of puzzles, with samples online
Puzzle Madness - Daily Sudoku, Jigsaw Sudoku, Kids Sudoku, KenKen, and Nonograms puzzles
Samurai Sudoku - Thousands of free sudoku puzzles to print
Word Search Maker - Make word searches automatically

Simplism Games - Puzzle games based on simple concepts