FASCINATING.
This is the first analysis I've seen of the RMS levels of various songs from different genres. Cool.
As you and I both said, this shows that the vast majority of CDs are already fully normalized. And as was already said, normalization has nothing to do with perceived volume, just because two songs hit the same peak doesn't mean their RMS levels are the same.
I have only one skepticism about the list you just posted, which is: I don't think that RMS measurement is a good judge for perceived volume, either. That doesn't make the list any less interesting, but if you're thinking that you could adjust the volume of a given group of tracks based on those numbers, I'd be surprised if it sounded like what you expected it to.
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Tony Fabris