Hey Joe,

 Funny you should mention Master and Commander. DTS placed a clip of it on the most recent itteration of their Demo disc a couple of years ago and we can't seem to get away from it. Part of it has to do with the fact that DTS hasn't issued anything new other than the BLU-Ray and *sniff sniff* HD-DVD demos which are mostly multi-channel music and some pretty HD landscapes (I'll be checking with DD and DTS as soon as I finish this post to see if they HAVE come up with something new)

The clip they include starts at the point in which the crew realizes there is a ship in the fog and they come under attack. Not only are the cannon blasts deep and extremely punchy but some of the scenes shot under the deck of the ship have some very convinving overhead footfall coded for the surrounds. It's just a very compelling demo. Even though I have seen it over 200 times and can recite the dialogue verbatim, I can't help but use it! With that Demo, the speakers pretty much sell themselves.