I do regularly build LimeWire for OS X and I do have some fixes in the code that are OS X specific and not yet accepted by the LimeWire developers. This version runs using Java 1.4 (it does not use any installer, just drag the app to your HD), reduces CPU load even if running with the Aqua look and feel and fixes some crashes relating to the use of many open files. You can find it at:

http://baghira.han.de/~jum/