Spiritual experience

Awareness of God — by Illtyd Trethowan: http://www.leaderu.com/truth/3truth05.html
The Experential Basis of Theism — by William P. Alston: http://www.leaderu.com/truth/3truth04.html

The Psychology of Religious Experience — A transcript of the Thinking Allowed television interview with Huston Smith.: http://www.thinking-allowed.com/smith.html
The Religious Experience of Philip K. Dick — A comic which appeared in Weirdo magazine, based on writings by the (atheist) science fiction author whose books inspired Blade Runner and Minority Report.: http://www.philipkdickfans.com/weirdo/weirdo1.htm

Christian Mysticism — An extended collection of pages on Christian Mysticism from InnerExplorations: http://www.innerexplorations.com/chmystext/christia.htm
Christian Mysticism - Quotes — part of a survey of Mysticism in World Religions; a good introductory or comparative quote list: http://www.digiserve.com/mystic/Christian/index.html
Christian Mystics — The Site for Christian Mystics / Traditional and Contemporary: http://www.christianmystics.com/
Mystics in Love — an introduction to some of the more interesting medieval Christian mystics: http://www.gloriana.nu/mystic.html
Who's Who in the History of Western Mysticism — an encyclopaedic survey of mystics and mystical movements, mostly Christian: http://www.clas.ufl.edu/users/gthursby/mys/whoswho.htm

The Varieties of Religious Experience — William James' 1902 classic, still in print, still referenced constantly in discussions of religious experience; this is an online edition.: http://www.psychwww.com/psyrelig/james/toc.htm