Please support your local independent and used bookstores. Fetchbook.info has a nice interface for searching the lowest prices on books from a lot of sites, including some of the larger independents.

books I really want you to read
A Language Older Than Words by Derrick Jensen
The Culture of Make Believe by Derrick Jensen
The Truthtellers edited by Brad Blanton
The Gift, I Heard God Laughing, and/or The Subject Tonight Is Love by Hafiz, as rendered by Daniel Ladinsky
books for relating
Practicing Radical Honesty, Radical Honesty and Radical Parenting by Brad Blanton
Emotional Intelligence by Daniel Goleman
Non-Violent Communication by Marshall Rosenberg
Difficult Conversations by Douglas Stone, Bruce Patton, Sheila Heen, Roger Fisher
Getting Real by Susan Campbell
books for thinking
Job's Body by Deane Juhan
A General Theory of Love by Thomas Lewis, Fari Amini, and Richard Lannon
Flow by Mihaly Csikszentmihalyi
Obedience to Authority by Stanley Milgram
Mindfulness and Meaningful Work: Explorations in Right Livelihood edited by Claude Whitmyer
Guns, Germs and Steel by Jared Diamond
books for transcending
Where The Wild Things Are by Maurice Sendak
Winnie the Pooh and other Pooh books by A.A. Milne
Mostly True and other Storypeople books by Brian Andreas
Jonathan Livingston Seagull by Richard Bach
Mohandas Gandhi: Essential Writings / selected with an introduction by John Dear
Living Enlightenment and Embracing Heaving and Earth by Andrew Cohen
The Way of Passion by Andrew Harvey
other translations and renderings of Rumi by Coleman Barks
When Things Fall Apart and most anything by Pëma Chodron
Zen Speaks by Tsai Chih Chung
books for transcending culture
The Fifth Sacred Thing by Starhawk
A People's History of the United States by Howard Zinn
When Corporations Rule The World by David Korten
The Underground History of American Education by John Taylor Gatto
Of Wolves and Men by Barry Lopez
Learning to be White by Thandeka
In The Absence Of The Sacred by Jerry Mander
Zen and the Art of Making a Living by Laurence Boldt
No Logo by Naomi Klein
books for fantasy
Arctic Dreams by Barry Lopez
The Lord of the Rings and The Hobbit by J.R.R. Tolkien
the Samaria novels by Sharon Shinn
Moonheart and most anything by Charles de Lint
books for presence
We're All Doing Time and It's a Meaningful Life - It Just Takes Practice by Bo Lozoff
Soul Retrieval by Sandra Ingerman
Waking the Tiger by Peter Levine
Wherever You Go, There You Are by Jon Kabat-Zinn
The Miracle of Mindfulness by Thich Nhat Hanh
authors without specific book recommendations
Osho (aka Bhagwan Shree Rajneesh)
I've read some of his collected talks and I regularly get scared, inspired, outraged, and have my mind and heart blown open. Good stuff.
Robert Fisk
My favorite journalist, he writes for the Independent newspaper in the UK.
Noam Chomsky
Agree or disagree with his theses, he's got interesting analyses.
books on my to read list
Radical Simplicity: Small Footprints on a Finite Earth by Jim Merkel
Your Money or Your Life by Vicki Robin and Joe Dominguez
Looking for Spinoza and Emotions Revealed by Antonio Damasio
The Body Remembers by Babette Rothschild
Why Zebras Don't Get Ulcers by Robert M. Sapolsky