I just wanted to let you all know that I successfully installed LimeWire on Mac OS X. Here are the steps:
1) Download it.
2) Open Terminal.app (Look in Mac HD:Applications:Utilities:Terminal.app)
3) Switch to the directory you downloaded it to (cd .. to move up on directory cd <dir_name> to move "down" a directory)
4) Install the thing: type "sh LimeWireMacOSX.sh". This actually launches a nice gui installer.
5) Answer the installer questions. You can change most anything later in the app, so don't worry too much.
6) Run the app: type "./Limewire" in the directory into which you installed Limewire.

Good luck.