The bottom line is that anything like this, be it Pandora or P2P is actually healthy for the music (and, indeed, entertainment) industry if you look at it from a logical standpoint. 9 times out of 10 (obviously an estimate based on personal experience, ymmv) these services are used to trial new music before it's purchased. There's no way that I'd have the diverse collection of music I have now if it weren't for P2P and last.fm (wonder how they're managing to get around the legislation that's closing Pandora for everyone else).