Although LimeWire is still my favorite filesharing client, Acquistion shows some promise. It is much more responsive than java clients such as LimeWire and it's interface follows Mac conventions more closely. I found a link to Acquisition at http://www.macorchard.com/sharing.html

Getting back to LimeWire, you may enjoy it more if you go through all the various options under the Limewire:Preferences menu and customize to your taste. I know I'm happier since turning off the internal mp3 player and changing the default shutdown behavior to actually quit rather than simply minimizing to my dock.