Michael Copeland compares ebook readers. One way publications may make money in the future:

Under one scenario publishers would license their content to an e-reader seller, such as Plastic Logic or Amazon, or to a wireless provider like AT&T (T, Fortune 500) or Verizon Wireless (VZ, Fortune 500). These companies would sell and manage the wireless e-readers and offer customers bundles of content the way a cable company does. You could buy subscriptions to individual magazines and newspapers or bundles of content on entertainment, sports, or business - or both.

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