I ripped most of Eric Clapton's August album. I already had two tracks off that album from a later Clapton compilation.

I re-ripped those tracks, honestly expecting no major differences. Turns out the compilation was a victim of that "loudness war" bullshit and was louder than the original release.

Granted, these aren't really a concern considering I use ReplayGain on everything, but it likely means a better sound in the long run.