McGraw Hill’s top 100 textbooks will be available on the iPad, using the “Inkling” app. The catch is they’ll cost 80 percent of the print editions. They justify it by pointing to interactive features, but competition is sure to drive these prices down. Some of their other E-textbooks only cost half as much. E-textbook sales are expected to double next year to $308 million. More in The Wall Street Journal.

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