Morpheus Preview Edition, sucks ass. Word of advice
Audiogalaxy is nifty, but sometimes you can't download a song because of "copyright" reasons. Usually you can find it under a different name, but it's not that big of a deal for some non-mainstream bands.
Yes, I noticed their Preview Edition sucked arse... I couldn't get it to log on. So I downloaded Gnucleus instead, also logs on to the Gnutella p2p servers and Morpheus PE is based on it so it looks almost the same. I didn't have any problems.
Unfortunately they're not as popular as the old Morpheus was so there's not a huge selection availible (yet). I'm considering downloading Kazaa again, which was the same as the old Morpheus but have been told by a friend that that network is about to collapse so not to bother.
Audiogalaxy is good, this is true... and yes, if you're looking for more obscure stuff it's not a problem that they have the copyright stuff set up.
As soon as one of them gets good, something happens to it *grr*