Brett Sandusky at Digital Book World has an interesting write-up on digital subscriptions. He ruminates on the pros and cons of two different models: the 'modular' subscription, where customers subscribe to one thing at a time, as they wish, versus the bundle model, where customers pay a fixed amount for a package deal which includes the content they want, plus other stuff which they may or may not want (for instance, when you purchase phone service just to get a cheaper deal on the Internet and cable). Sandusky prefers the 'modular' model. He aims to treat his customers like grown-ups who know...