Zodiac
First of all, this is not a serial killer movie. It's more like a fantastically great episode of CSI, but funnier than you'd expect. Technically and visually, it's flawless. By the end you'll feel just like the investigators did -- the ending is powerful on many levels. To nitpick, I think the movie would have benefited from a bit more emotion and a more inspired score. Whatever. Watch this movie!