Saw Watchmen today and loved it.
One of the most memorable sequences in the film has got to be the opening titles. Set to the tune of Bob Dylan's "The Times They Are A-Changin'", the credits provide much of the back-story involving the characters, and the alternate U.S. history depicted in the film.
It's viewable here, but Warner Bros. is so keen to keep pulling it down, it will likely soon be gone.