It has been 16 years since Channel Oneâ€™s advertising-supported news broadcasts first slipped into the commercial-free space of middle schools and high schools; today, its in-class advertising, it says, reaches seven million students. A $4 billion-a-year business cannot change fundamentally overnight; the shift from printed to electronic textbook will take years. In the meantime, a small publisher of college textbooks, Freeload Press of St. Paul, seeks to take advantage of this flux with a new concept: providing free e-textbooks to students. The catch? Ads are inserted within the text. Here's The NYTimes With More.