Movies:
I happened to have "The Patriot" from Netflix when I first received my Ascends. Mel Gibson's voice was quite remarkable in that film--between the 170 fronts, 340 center, and Hsu subwoofer, everytime he spoke, my couch was vibrating quite noticeably.

"The Bourne Identity" has some very cool moments in its soundtrack that show off the imaging of the Ascends nicely.

Music:
For you George Bush fans out there, the last song on the Dixie Chicks latest album, "Top of the World", sounds quite remarkable, with a good variety of instruments (guitar, electric bass, cello, violins), and Natalie Maines' voice is very clean and clear. In my case, it was a very wife-friendly track to use to win her over to the Ascends.