Hi William,
Nice to meet you. In terms of e-books I am sure there is alot out there but my experience with e-books is that, beside the out of copyright books (e.g. Pilgrims Progress) and the bible, most are fairly lame.
On the side I had to present a paper at a Spirituality and Psychology conference @ the Uni of Western Sydney last year and have since been very interested in what people mean by spirituality. If interested send me a PM I would love to have a chat about what you, yourself mean by the term.
Once again welcome and, if you get a chance you might want to re post in either general discussion or What does God say about .... forums.