Eat, Pray, Love
I usually try to find books that I feel will be meaningful to friends. I think about their personalities, likes and dislikes and also what is going on in their lives. For example, a friend of mine is going through a break-up and she likes nonfiction, so I'm giving her Eat, Love, Pray by Elizabeth Gilbert. Another friend is pregnant, so I'm giving her What to Expect When You Are Expecting. In the past, I have given The Pillars of the Earth by Ken Follett and anything by Isabelle Allende.