We saw Spiderman 3 today. It was easly the best of the trilogy, and it gave the impression that Sam Raimi had been hanging on to some of what he did in this from the very beginning. I came away thinking the moral message was the sort of thing a Christian would write to try to motivate some of the less common and less popular elements of Christian ethics. As far as I know, Raimi isn't a Christian, but the influence of Christianity on our culture, as waning as it is in general, is felt very clearly in this film. See Rick Mansfield's excellent review for more.
Update: Sam has further thoughts in a very different direction (with some spoilers).