There's at least one textbook based on Wolfram's proprietary CDF format. http://www.wolfram.com/mathematica/customer-stories/developing-interactive-textbooks-w

There's at least one textbook based on Wolfram's proprietary CDF format. http://www.wolfram.com/mathematica/customer-stories/developing-interactive-textbooks-with-cdf.html http://www.wolfram.com/mathematica/customer-stories/developi... (I like your visualization page – a nice way to explain that part of wavelet compression.)