The UK's Guardian Newspaper is conducting an interesting experiment in on-line publishing with its Guardian Shorts. These are a series of eBooks, sold via the Amazon Kindle and Apple iTunes stores. These have commentary on current events, and are up to 30,000 words each, costing less than £4. The first is "Phone Hacking: How the Guardian broke the story", 5 August 2011.
Newspapers repackaging material for educational purposes is not new, but doing this as an eBook may provide a whole new market. However, it remains to be seen if the content is any better than that free on-line. As an example the Wikipedia's "News International phone hacking scandal", is 14,000 carefully written, researched, referenced and most likely less biased, words, for free.