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According to the National Association of College Stores in a 2007 survey, the average cost of a new college textbook was $53. The founders of Flat World Knowledge, which launches with its first run of college textbooks this fall, consider that too high--so high, in fact, that they'll be offering textbooks for free, at least in versions that can be read online. If the student wants to buy a printed copy of the textbook, it will be printed on demand by the company and provided in color for one price or black and white for a lesser price. For the student who prefers to listen to the book on an MP3 player, audio versions will be available too. Each format will have its own cost structure, but on average, it'll tally up to about $30.

This might be an interesting way to facilitate conversation in classes and professional development.