Meta:Links

Looking for more puzzles? Try these excellent sources.

Websites

Car Talk Puzzler - sometimes automotive, sometimes more math/logic based.
Maths is Fun - math and logic puzzles appropriate for math education.
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.

Problem Solving by Thomas DeFranco and Charles Vinsonhaler.
Problem Solving Through Recreational Mathematics by Bonnie Averbach and Orin Chein.
Any book by Martin Gardner - perhaps the greatest contributer to mathematical puzzles ever. He will be missed.
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.