I have written a short piece called The Real Art of Goal Setting which tells the story of the man who broke all the rules to walk a tightrope nearly a third of a mile high and what we can learn about goal setting from him.
Here are my favourite links:
Postive psychology is the foundation of a Vision Intensive day. Martin Seligman is the founder of positive psychology a field of study that examines healthy states, such as happiness, strength of character and optimism. Here is his TED talk explaining more.
Here is some interesting research from Stanford University which shows that nearly two-thirds of CEOs do not receive outside leadership advice but nearly all want it.