I've also recently discovered the power of bookmarks and the cool dictionary feature in the Kindle app. I still like going to the library and going through the books, picking one out and reading it, but I seem to be able to read ebooks like 3x faster because kids.
I hate the thought that books might go out of style, but I read the news online now and only buy an actual paper for important events and job hunting...
Do you think tangible books are going to disappear completely in favor of ebooks? Does it bother you that they might?