Paul Graham is an essayist, programmer, and programming language designer. If you haven't read his essays on programming and software engineering you should consider.
His latest essay on Apple's iPhone store is a good read on how business models that work for product n may not work for a product y. In this case Apple is treating iPhone apps as if they were iTunes songs, and Apple being the broker between the consumer and software producer. The nature of the development process of the iPhone apps requires frequent, if not daily, iteration of software releases, while Apple favors a lengthy review cycle before an app is published in its stores. What will it take for the developers to switch platforms? When will Apple become the evil empire? You can find the latest essay here and the rest of the essays here.
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