Books were a product of their time. Interactive media allows us to leverage techniques such as annotations, in-context model building and testing, building memorization using spaced repetition which should make an immense difference in learning effectiveness.

It's a shame that Google, who wanted to organize all of the world's information, still struggles if you want to find best learning resources (books, videos, podcasts, courses, Q&A forums, cheatsheets etc.) on a topic. It's good at answering specific questions but not so good at suggesting at learning path that makes the best use of amazing resources that exist on the Web.

This is the problem we have set out to solve. I'd love to see more participation from HN users: https://github.com/learn-awesome/learn-awesome