In reply to Tricia Aanderud.

For me replacing books with videos is like going back from computer hard drives (direct access) to tape drives (sequential access). Books are near-direct access media that you can browse fairly quickly to find what you are looking for. Videos, on the other hand, are sequential access media that you can't browse, you either watch them patiently, or don't. They are still useful for learning totally new material, but who is going to spend 2 hours watching a video to only find a useful piece of information somewhere between 100 and 105 minutes!