I'm actually going to have to disagree with this one...

For large compilations, I don't see the harm in joining them into one big list (altough I still prefer to preserve the original "seperate" playlists structure like the CD's). But for double length CD's like NIN's the fragile, thoses songs were specifically selected to be on two seperate discs. I would even argue that Pink Floyd albums were meant to consist of two parts. Two acts in a play if you will. (too bad DVD authors didn't take this care in selecting layer switches! )

Trent Reznor hired a long time Pink Floyd producer (the name escapes me) to select the track order (and what should remain a b-side to singles). The discs are intentionally seperate with a beginning, middle and end to each disc. I imagine, the same care went into the Dark Side of the Moon.