P.S. I Love You is everything I generally hate in a movie: it's overly sentimental, sometimes trite, mostly predictable and too often superficial.
But God help me, for some reason I liked this movie.
Hillary Swank's character, Holly, spends most of her adult life focused on the future. She's ambitious, and never very content with her current standing in life. Although a nice enough person, Holly's discontent causes her to be unhappy with her life, and creates some mild tension with her more relaxed, have-fun-with-life husband, Gerry (played by Gerard Butler).
Early in the film Gerry dies, leaving uptight Holly alone to become even unhappier, and depressed. Once fixated too much on the future to be happy, Holly is now so obsessed with memories of the past that she can't function effectively.
Until she receives Gerry's postmortem gift.
Prior to his death from cancer, Gerry arranged for a series of letters to be delivered to Holly. Each letter provides fun and memorial insights into life, designed to teach Holly to enjoy the moment. To pay less attention to the future, and to leave the past behind. Gerry helps Holly understand that it's only in the moment that one can be truly happy, and it's on that foundation that a genuine and meaningful life can be lived.
It's a lesson more folks should pay attention to.