An out of body experience is also known as astral projection. This takes place when the spirit/soul leaves the physical body behind to explore other planes of existence, or the physical plane without the body.
Astral projection journal, out-of-body techniques, questions and answers, remote viewings, and large selection of astral projection books and tapes. http://www.jonasridgeway.com/
This site contains a summary of ten arguments based on paranormal phenomena indicating personal survival after death. Amongst them: Near-death, out-of-the-body, and deathbed- experiences. http://www.xs4all.nl/~wichm/paraps.html
Spiritual Travel provides a means of spiritual growth by consciously allowing the individual to explore and learn from voluntary out-of-body states. An in depth look at this is provided. http://www.spiritualtravel.org
Information on the topic, including near death experiences. A question and answer section and links to related pages is also included. http://www.spiritonline.com/obe/
A non-profit research and educational organization that studies out-of-body experience, bioenergy, paranormal, and consciousness development. http://www.iipc.org
Self development through non-physical exploration (astral projection), focusing upon reader-submitted diaries and techniques. http://www.outofbody.co.uk
Free online course in Astral Travel, studying: Astral Projection, obe's (Out of Body Experiences), Lucid dreaming, and Awakening Consciousness. http://www.astralweb.org