First a foremost - a massive thumbs up for this one. Really enjoyable good film.
Thoughts:
1) The Battle Zion - oh my Gawd! Frickin' A! One of the most awesome fight scenes I have ever seen. Well considered, clever, tense, dramatic...everything.
2) I actually thought the final battle was a little on the short side!
3) Very ambiguous ending, nothing really explained, but nevertheless very satisfying. And a neat little postscript, too.
4) Loved the Trainman section. Neo - "Oh




."
5) Something I did notice. All three films follow a pattern. First, something that hints at the rest of the film. Then, a scene involving dancing. Then, the big middle-of-the-film awesomeness. Then the end. Think back of the basic structure of each film, and you'll see they match up quite neatly. I went into this film wondering if, about 20 minutes, we'd be in some sort of club. Doors open - clubbers everywhere.
6) Hugo Weaving - what a guy.
7) Keanu does really well in this film. Couldn't fault his performance at all. He had everything down, the cool calm power of Neo, the much more vulnerable human side in the real world.
Basically, the film rocks in large amounts, and I look forward to hearing what everyone else thinks about it.