Wife and I just watched this yesterday as well, rental from redbox, and like Matt, was reaching for the remote in the first scene to turn it down. This has got to be one of the best mixed soundtracks out there. The surrounds were used just right through out the movie.
Nolan does make some movies that make you think, and this was one of his best. Are we allowed to talk about the movie itself? I'll do the SPOILER and scroll thing...
I liked the way they did time as a dimension, very clever way of showing another dimension. Although I was a little confused as to how he was "saved". Were the future us in control of the black hole? And I don't quite get how he ended back at Saturn. I think the addition of Matt Damon wasn't needed and detracted from the movie somewhat. All in all, an excellent movie, and I will probably buy the bluray just for the special features that Chris mentions.