I have to agree that there are many things better about Morpheus (KaZaA and Grokster, to name a few -- these all use the same FastTrack software). I'm not sure about Morpheus, but KaZaA has a limit of 128 bit MP3s (and pop-up ads all over the place). Grokster does not have the 128 bit limit, and Morpheus doesn't pop up ads (although it does have ads within its UI).
BUT Napster still has the best UI (even though it is FAR from perfect). It is clean, more stable, and you can immediately see and sort by file size, song time (VERY important to make sure you are downloading the right or full version), etc. And it still gives you another alternative source when you're looking for that obscure MP3. Of course, it only is for MP3s while the others have everything.
Gnucleus is a very good Gnutella client (and less of a resource hog than BearShare, for example), and is another great MP3 (and other file) source.