If you're into Japanese Anime then you definitely should check out Appleseed. I have not heard ANY other movie make as much use of the QS8s (surrounds) as this movie. Story is kinda decent but the visuals and audio will leave you breathless. Really cool animation if you have an HDTV.
I have some others, can't recall off the top of my head but Last Of the Mohicans is one. Jurassic Park, Titan A.E., Akira, Gladiator, and Blue Man Group.
I'm sure there are tons of others. I've also read (and not heard myself) that Kill Bill 1/2 and Fast and Furious have excellent DTS soundtracks. Can anyone else confirm these titles have good sound?
