This version Peruvemba sees playing a major role in digital textbooks in the future.

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Walter Isaacson's new "Steve Jobs" biography reveals that digital textbooks and Internet-enabled TV sets were among Jobs' next areas of focus for Apple.

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Digital textbooks can expand opportunity for kids everywhere, he says.

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In some categories, such as textbooks, digital books are growing rapidly.

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Earlier this year Apple unveiled a new version of its digital book store that supports textbooks, signaling that the company sees many of the same opportunities.

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About 3 years ago, Indiana became one of the first states to allow schools to take taxpayer money earmarked for textbooks and use it on digital technology.

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Are textbooks no longer relevant in the digital age?

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In the short term, the BYOD model may be sufficient because most of the digital content students are using closely mirrors traditional print textbooks.

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In another demo, Apple's Roger Rosner showed off textbooks for the iPad that allow students to zoom in on pictures of cells, dissect digital frogs and make notes and highlights on the e-book pages.

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