I enjoyed reading a fine blogpost about books by Scott Pauley here: http://scottpauley.wordpress.com/2012/03/13/a-few-thoughts-on-books/
He discusses his influences and where he is today in his thinking about a personal library. Then he proceeds to give advice. Since he is Vice President at Crown College in Powell, Tennessee, I'm sure he desires to impact students who will be in the ministry. Still, what he says applies to us all.
He gives pointers on sifting through options as there are so many books on any given subject. He reminds us where to keep the Bible in regards to the books we gather about the Bible. Then perhaps best of all, he offers suggestions on how to get the most out of your books. I encourage you to read his blogpost as he has said things that, in my judgment, need to be said.