There was an interesting discussion thread on Hacker News today, on the subject of the value of reading books.
The proposed premise was that, essentially all information must be freely available on the world wide web, right? Is it still worth it to read books? Or can you just scour blogs and tweets to find anything you want to know?
My own personal book-reading time has waxed and waned over the years; I would readily and heartily agree that I get more enjoyment and satisfaction out of reading a book than I do out of most web browsing, but web browsing is easier, and it at least superficially feels like I am reading and learning.
The way I see it, non-fiction books are all about distillation of information. Yes most of the information from books is freely available online in some other form, but you'll have to dig for it in many places, and learn from many narrators.
The benefit of the book-length information product is that a single author went through all the possible sources and used their expertise to give a coherent story on a subject. You can think of the book as someone who read 100 blog posts for you and extracted the useful info from them.
This should also be an encouraging thought as a writer. It can be easy to talk yourself out of writing a book on a subject because everything that you know about it, you learned from someone else! That whole sum of knowledge is already out there on the web! But you can nevertheless distill your own coherent story into book form, and produce a beneficial educational experience.