Well, I'd have to say that I don't think the "I want to keep my songs organized like..." argument works because with a little extra time, you can easily put them in two places, and have them organized both ways. My By Artist tree contains nearly the same tracks as the By Album tree... If you want two different views, just make them...

I've also been considering messing with emptool to see if I can automate my uploading of albums, so that I can specify where the multiple coppies go... But I've never even downloaded emptool, so I don't even know if it'll work...

Matthew