The title sounds hokey, but it's one of the few self-help books that ever made much difference for me.
The secret is simple but for most people, elusive. We talk about it all the time here on HN.
http://www.amazon.com/Ultimate-Secret-Getting-Absolutely-Eve...
SPOILER below
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"I am willing to do whatever it takes to get what I want."(My spoiler doesn't do it justice. Take an hour and read the book.