kazaalite k++. built in ip filtration (TONS of federal and international agencies, plus just about ever recording company or affiliate known to man), custom automatic resending of searches when there aren't enough sources, disables port 1214 (an external program cannot detect that you are using kazaa to access the fast track network). hasn't been updated lately, but you can still get it here.
http://www.allianceweb.sk/free-download/kazaalite.php