Word Ways - Liguistic and recreational puzzles and essays

http://www.wordways.com/articles.htm

Word Ways - Liguistic and recreational puzzles and essays;
Excellent.

Recreational puzzles and Lateral Thinking

http://rec-puzzles.org/

Recreational puzzles on several topics;
Food for thought and it is good food.

Also, check out http://rinkworks.com/brainfood/
for other set of puzzles. The secion on 'lateral thinking puzzles' is pretty interesting.