1) Two channel music performance
Norah Jones Come away with me; Pink Floyd DSOTM, Metallica Garage Inc, Reissue Disc 1; Diana Krall Girl in the other room
2) Mulichannel music performance
James Taylor Live @ The Beacon Theater
3) Mulichannel effects separation
Blue Man Group Audio , a real center channel workout.
4) LFE (Low Frequency Effects)
Techmaster PEB, Bass Computer. I can't believe someone else mentioned Techmaster PEB! Wow, that's not a disc everybody has (or has even heard of), but it has the lowest bass I've found and I've been using it for over 10 years so I know the recordings really well, even though the music is very very very cheezy... but damn it's deep! Also, the movies U571 & Saving pvt ryan.
5) Other (list any/all auditory criteria (things you listen for) you consider when evaluating equipment).
What I love most to find in recordings for playback in my system, is the best reproduction of vocals I can possibly find (acoustic guitar too). I usually play my system louder than most people do, I want it to sound like it's being performed in front of me, so that's how loud I play most things, from jazz, rock, metal & bluegrass. I love quality recordings.