Good stuff, Turnoi. I think it could also be helpful to ESL/EFL students who are preparing for college level courses conducted only in English. About ten years ago, I taught an advanced ESL class in America. Those students were all preparing to take college level English the next quarter and many of them had a high degree of anxiety in terms of their ability to deal with such classes. The ebook you mention, along with many other excellent online resources would greatly benefit such students in terms of home study but would also be a valuable adjunct for the teacher.

Here's one of my favorite sites for teachers and students: http://owl.english.purdue.edu/owl/resource/678/01/