One of the foremost experts in researching the near-death experience is Dr. PMH Atwater, with whom I am personally aquainted. She has written at least eight books about the topic and is an experiencer herself.
On www.Near-death.com Atwater offers two free ebooks. "The Challenge of September 11" was originally part of a book on death and dying, but was immediately censored by numerous New York publishers, as they felt the public was not ready to hear such things. "Beyond the Indigo Children EXTRAS" is additional material regarding PMH's book "Beyond the Indigo Children"
PMH offers informative articles about Near-death experience PMH Atwater at http://www.cinemind.com/atwater/ndearticles.html
For more information about researcher and NDEr PMH Atwater, see http://www.near-death.com/atwater.html