The Art and Craft of Problem Solving:

The newly revised Second Edtion of this distinctive text uniquely blends interesting problems with strategies, tools, and techniques to develop mathematical skill and intuition necessary for problem solving. Readers are encouraged to do math rather than just study it. The author draws upon his experience as a coach for the International Mathematics Olympiad to give students an enhanced sense of mathematics and the ability to investigate and solve problems.

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http://rapidshare.com/files/186329401/The.Art.And.Craft.Of.Problem.Solving_2ed_Zeitz_0471789011.rar