The Time Traveller's Wife

This was not my recommendation, but it was one of my best summer reads ever.  When I first heard of it, I thought it sounded like a dumb, science-fiction romance, but it is far from it.  A woman has a life-long relationship with her future-present husband.  He time-travels unwillingly, and without warning, so that she meets him for the first time when she is six years old.  He travels back to her at different ages.  For example, he might be 30 when he meets her at 8.  He meets her for the first time, in real time, when he's 28 (I think), so even though she's known him most of her life, for him it's the first time.  Very interesting concepts on time are developed.  Also, the personalities of the two protagonists are wonderfully rendered.  The text is told from both characters' points of view.