Text books are nearing distinction as the dinosaurs. "Replacing ink with digits"

This months http://www.audioed.com/ Monthly Electronic Newsletter talks about "Replacing ink with digits" The Audio Journal says "Are Schools are coming closer to realizing the textbook free classroom with new web sites making it easier to download content. Included are links to some web sites with curriculum content." I think we are near a tiping point in education with online content coming of age and textbooks becoming outdated before they are even off the printing press. By the way is pluto in or out of the plant list this week.