Some interesting books to read, and learn more about Obe's would be Dr. Robert Monroe, Journeys out of the Body,and Far Journeys.
He's also developed a great program to help others obtain the obe state, thru music "Hemi-sync" all of which should be found here:
http://monroeinstitute.com/
Very informative, extremely cool journeys he's had, with a how to guide at the end of Journeys out of the body.
I've been trying myself to achieve this state of awarness(as a teenager one time)(adult now twice) but finding it difficult to maintain.
I found this site for your reading pleasure:
http://users.telenet.be/sterf/texts/...ody-monroe.pdf
Anyway, hope this helps.
Safe Journeys