Wanna elaborate some? :)

Editorial Reviews

Amazon.com
A phenomenon when first published in 1972, the Inner Game was a real revelation. Instead of serving up technique, it concentrated on the fact that, as Gallwey wrote, "Every game is composed of two parts, an outer game and an inner game." The former is played against opponents, and is filled with lots of contradictory advice; the latter is played not against, but within the mind of the player, and its principal obstacles are self-doubt and anxiety. Gallwey's revolutionary thinking, built on a foundation of Zen thinking and humanistic psychology, was really a primer on how to get out of your own way to let your best game emerge. It was sports psychology before the two words were pressed against each other and codified into an accepted discipline.
The new edition of this remarkable work--Billie Jean King called the original her tennis bible--refines Gallwey's theories on concentration, gamesmanship, breaking bad habits, learning to trust yourself on the court, and awareness. "No matter what a person's complaint when he has a lesson with me, I have found the most beneficial first step," he stressed, "is to encourage him to see and feel what he is doing--that is, to increase his awareness of what actually is."

There are aspects of psychobabble and mysticism to be found here, sure, but Gallwey instructs as much by anecdote as anything else, and time has ultimately proved him a guru. What seemed radical in the early '70s is now accepted ammunition for the canon; the right mental approach is every bit as important as a good backhand. The Inner Game of Tennis still does much to keep that idea in play. --Jeff Silverman

Book Description
The Inner Game of Tennis is a revolutionary program for overcoming the self-doubt, nervousness, and lapses of concentration that can keep a player from winning. Now available in a revised paperback edition, this classic bestseller can change the way the game of tennis is played

Trading In the zone.

http://www.amazon.com/gp/product/0471379085/ref=wl_itt_dp/104-6555769-5267100?ie=UTF8&coliid=IGHCY0TA6OJ6L&colid=1HUS6YFDH7LOU

And Then the Vulture Eats You

Not really a mental games book, just a good collection of well written ultra stories.

The Mental Athlete by Kay Porter.

She's a local friend and has trained many athletes, including ones with the Ironman as their goal. I've used a lot of the techniques in her book and I think that as athletes if we're not working on the mental part of our game, we're missing a big and crucial part of training.

I got a copy of the book from the author a few years ago at the JFK 50 miler. He is a reasonable fellow and a good athlete..I've seen him since in Lake Placid.
I have been interested in zen metaphysical stuff since I was a kid even though I don't ascribe to any religion...I know my way around it quite well. My minor was R&P.
I read the book...cover to cover...twice. I pick it up now and again.
Outside of a few snippets of real wisdom the book isn't ground breaking...just a re-hash of ideas from a different angle. I thought the writing was less than stellar. It was not an easy read, which is a real impediment to understanding. While the author obviously knows his stuff...it could have been presented in a more accessible way.