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Looking for more puzzles? Here are some problem solving related resources.

Collections and Blogs

Monday Puzzle Blog by Alex Bellos.
Riddle of the Week from Popular Mechanics.
Varsity Math Puzzle block of the Wall Street Journal.
Project Euler. A series of challenging math and computer programming problems.
MathPuzzle.com
Tanya Khovanova's Math Blog Puzzles.
Car Talk Puzzler - sometimes automotive, sometimes more math/logic based.
Maths is Fun - math and logic puzzles appropriate for math education.
Problem of the Month on Math Central.
pzzls - nice site with a good variety of math and logic puzzles, as well as some others.
The Math Challenge Problem from the University of Norther Colorado.

The Math Factor A math puzzle podcast from a while back.
The Sunday Puzzle on NPR. Mostly word puzzles, but occasionally an interesting math nugget.

Problem Solving by Thomas DeFranco and Charles Vinsonhaler.
Problem Solving Through Recreational Mathematics by Bonnie Averbach and Orin Chein.
Books by Martin Gardner - perhaps the greatest contributer to mathematical puzzles ever.
Mathematical Puzzles: A Connoisseur's Collection by Peter Winkler.
The Riddle of Scheherazade: And Other Amazing Puzzles by Raymond Smullyan. Very nice collection of puzzles, all tied together in a story. Plus, some logic content as well.
Sideways Arithmetic From Wayside School by Louis Sachar. A collection of cryptarithmetic puzzles.

Mind Trap - a game with hundreds of puzzle cards. Lots of lateral thinking puzzles.
Professor Layton and the Curious Village - for the Nintendo DS. Loads of puzzles wrapped up in a fun mystery.
Professor Layton and the Diabolical Box - sequel to the Curious Village. Another great Nintendo DS puzzle game.