Meta:Links

Looking for more puzzles? Try these excellent sources.

Websites

The Math Factor A math puzzle podcast.
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.
Richard Wiseman's Blog - new puzzle every Friday, answers on Monday.
Bradley University's Problem of the Week (no longer available). No longer active, but there are 10 years worth of archives. From professor Alberto L. Delgado.

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.
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.