Well, I can tell you about the reverse situation. In those provinces where HST is in effect, briefly, books with additional components, textbooks particularly, on campuses of Nova Scotia, New Brunswick, and Newfoundland, books that carried a CD-ROM component or an online access code for additional information but that were primarily books, were briefly subject to the full HST. They were deemed temporarily to be non-books, and that certainly had a chilling effect on sales in those provinces, and some surprise additional expenses for students who weren't expecting those costs. Fortunately, those provinces have also taken the lead in changing the definition of that kind of book now, and the HST has been removed from those books.
On October 4th, 2006. See this statement in context.