What is it with the chick flick marketing people anyway? I've noted here before the times I've been pleasantly surprised by movies that I had assumed, from the previews, would be complete crap - or at least, something entirely different from what they turned out to be (see: Prime, in Love in New York), and P.S. I Love You is another example. Not that I thought the trailer looked like crap. But I thought it looked like a light-hearted, upbeat romp (from a grim starting point, sure) wherein Hilary Swank's widow moves forward with her life, re-learns how to party and meets cute boys.
I guess in some ways it's all those things, too. But Gerard Butler's letters have as much to do with the past as they do the future. His dead Irish husband forces Hilary Swank's character to confront who she was and who she became, to think about who and what she cares about most, and to see in herself what he always saw. (Yeah, you know I cried my eyes out.) It's touching and funny, and doesn't lead you exactly where you might expect it to - and all three leading men (Gerard Butler, Jeffrey Dean Morgan, and Harry Connick Jr.) are dreamy.
In the end, this movie was about coming to terms with an old relationship rather than starting a new one - that part, I suspect they're saving for a sequel.