I read "The Alchemist" by Paolo Coelho, and it really touched me. It's such a simple story, almost like a fable, but it's all about following your heart in search of your dreams, no matter how daunting the task may seem to be.
I also really love "The Missing Piece" by Shel Silverstein. It's actually a children's book, but that book meant more to me when I was in college than it ever could have when I was a kid! It's all about appreciating and loving yourself, and realizing that you don't need to have everything to be truly happy. This book is definitely going to stay on my bookshelf!