My dictionary defines "therapy" as a process having "healing power or quality". Something that promotes healing, then, would appropriately be called therapeutic. From this point of view, reading a book designed to promote your psychological well-being has a good chance of being a therapeutic experience. Moreover, if that book was interactive and tailored exactly to fit you, rather than some "average" man or woman, it undoubtedly would be even more powerful in its healing capacity.
That's pretty close to what e-therapy is like: an ongoing dialogue that creates a self-help book whose topics and depth of coverage are determined by your specific needs and interests. Your co-author is a trained professional, someone who understands how to use the principles of Psychology to help people improve their lives.
