Magazines, newspapers, comic books, book-of-the-month club, anything that is periodical, regardless of the period—daily, weekly, monthly, bi-monthly, quarterly, yearly—that you subscribe to that can be pushed to your device after agreeing to accept the future delivery of content.
Thanks. Makes sense. I recently read a white paper from Xerox Corp about XML based cloud computing but it was about dynamic content rather than static content such as the things you noted. What XC is doing is where I think most things are going. It seems that Apple is just extending its iTunes approach to the other material.