Just to get this thread started, I thought it would be fun to start putting together a list of materials where people are talking about spirit travel. With that thought in mind, the first person that comes to mind is Ian Clayton. I think he's one of the first Christian forerunners in this department. He has a couple of REALLY good books that will blow your mind but... they are totally awesome! "The Order of Melchizedek" is his newest book. All I can say about it... it's totally bodacious! "Realms of the Kingdom - Volume II" is a newer version of the first volume but with a few different chapters. The gateways are now in a book of their own. Again, WOW to this book! "Gateways of the Three-fold Nature of Man" is a book that helps you work through the junk in your life so you can be free of what keeps you from moving forward. No more of this... I know there are other books out there so as you become a registered member of this site, feel free to add your favorites in a new thread below. And, tell us why you like them.
The Beginner's Guide to Traveling in the Spirit by Michael C King (myself) is another option. Available at http://www.thekingsofeden.com/ This book is geared toward anyone who is new to the subject, has a lot of questions, wants to know where it is in the Bible, or a myriad of other related things. Non-"new" people can still benefit from it, but it starts from the ground up, assuming the reader is not overly familiar with it, and getting into deeper things such as the Courts later in the book.
A friend took his book to church with her and the pastor told her to not read it. She found a new church.