Publishers' latest digital products may deserve a category of their own.
Textbook publishers argue that their newest digital products shouldn't even be called "textbooks." They're really software programs built to deliver a mix of text, videos, and homework assignments. But delivering them is just the beginning. No old-school textbook was able to be customized for each student in the classroom. The books never graded the homework. And while they contain sample exam questions, they couldn't administer the test themselves.