Online 'Textbooks' See College Doors Opening

We've been watching this trend for quite some time. It's now clearly in an exponential growth curve and could well be mainstream in less that a decade:

As textbook prices skyrocket, college students and faculty seeking more affordable options increasingly are turning to "open textbooks" as an alternative.
Open textbooks are free textbooks available online that are licensed to allow users to download, customize and print any part of the text. Professors can change content to fit their teaching styles. Some authors offer a print-on-demand service that produces professionally bound copies for $10 to $20.

Textbook prices have outpaced inflation 2-to-1 in the past two decades, says a 2005 report by the Government Accountability Office. They account for 26% of tuition and fees at four-year public universities and nearly three-quarters of costs at community colleges, the GAO says.