Insightful Books - in no particular order:

A Brief History of Time
by Stephen Hawking

Demon Haunted World
by Carl Sagan

The Age of Spiritual Machines
by Ray Kurzweil

The Cosmic Serpent - reviewed September 2001
by Jeremy Narby, Ph.D.

The Center of the Cyclone
by John C. Lilly

Women on Top
by Nancy Friday

Stranger in a Strange Land
by Robert Heinlein

Loose Ends: Primary Papers in Archetypal Psychology
by James Hillman

Care of the Soul
by Thomas Moore

Philosophy in the Boudoir
by Marquis de Sade

The Lifestyle
by Terry Gould

400 Years of Imaginary Friends
by Kenneth and Talita Paolini