Marketers are experimenting with new pricing models for e-books. In a twist, marketers may make e-books available for free in exchange for your attention to ads that may appear within the books. Various forms of advertisements are now being explored, including sponsorships, videos, graphics, or text that may appear when the book is first opened and along the borders books. Ads can be targeted based on the content of the book, the demographic and profile of the reader, and perhaps even search results from in-book searches now offered through services like Barnes & Noble’s Nook, which allows you to look up highlighted terms on Google or Wikipedia. It looks like in the digital age, book reading will be moving closer to concepts like magazines.