Some books (not necessarily philosophical):
About Looking by John Berger
Aikido and the New Warrior by Richard Strozzi-Heckler
The Anatomy of Change by Richard Strozzi-Heckler
A Book of Five Rings by Miyamoto Musashi
Celestial Navigation by Anne Tyler
Collected Stories of Carson McCullers
Door Into Summer by Robert A. Heinlein
Earth Abides by George R. Stewart
Eden Close by Anita Shreve
The Empty Mirror by Janwillem Van De Wetering
A Glimpse of Nothingness by Janwillem Van De Wetering
A Green Journey by John Hassler
Human Options by Norman Cousins
I Know Why the Caged Bird Sings by Maya Angelou
In Search of the Warrior Spirit by Richard Strozzi-Heckler
Inner Game of Tennis by W. Timothy Gallwey
The Infinite Passion of Expectation by Gina Berriault
Inspector Satio's Small Satori by Janwillem Van De Wetering
Leadership is an Art by Max DePree
Life, the Universe and Everything by Douglas Adams
The Little Prince by Antoine de Saint-Exupery
The Man Who Planted Trees by Jean Giono
The Manager's Bookshelf by Jon Pierce and John Newstrom
Mister God, This Is Anna By Finn
The Neverending Story by Michael Ende
NeverEverDrop: A Raindrop's Search for the Meaning of Life by Rodger Stevens
One True Thing by Anna Quindlen (much better than the movie.)
The Quickening Universe by Eugene F. Mallove
The Rocks Begin to Speak by Lavan Martineau
The Second Tree From the Corner by E.B. White
The Story of Philosophy by Will Durant
Synchronicity, Science and Soul-Making by Victor Mansfield
The Tao of Philosophy by Alan Watts
The Tao of Pooh by Benjamin Hoff
A Touch of Wonder by Arthur Gordon
Travels with Charley by John Steinbeck
(And last but not least:)
The Meaning of Words: Analysed into words and unverbal things, and unverbal things classified into intellections, sensations and emotions by Alexander Bryan Johnson