Star Wars Episode III
Yesterday I went to an advanced preview showing of Revenge Of The Sith, 2 weeks ahead of the scheduled release date in Japan (this sounds more impressive to people in Japan than those reading from home where Star Wars has been out for about a month already!!).
I thought the film was by far the best of the three 'prequels' - the story was more fast-paced, the plot was a lot darker and it was really satisfying to see the two trilogies come together with the foundations being laid for Episode IV.... go and see it!