My favorite spiritual resources:
The Headless Way -- Douglas Harding - Excellent excercises to "See who you really, really are" as Douglas Harding used to say. Thanks to his work I finally understood non-duality and Oneness and make the experience of it part of my daily life
Spiritualteachers.org: Your place for spiritual teachers - Great hub with links to many sites and teachers. The rankings of spiritual teachers are fun too.
TAT Foundation | Spiritual Search Site and Place of Friendship - The TAT foundation was founded by Richard Rose, i.m.h.o. an underestimated spiritual giant. Lots of info and great articles in the monthly online magazine