Just found this from Unitethecows. Haven't checked it out.
Kazaa Kontrol Leech Killer is a Kazaa utility that will check each person in your download que. It will check to see if they are sharing files and if they are not sharing then a message will be sent to them saying you must share to download from this person and then their download is canceled. If enough people use Kazaa Kontrol then more people will share, which means faster downloads and more files for everyone!!!
http://www.instantpromoter.com/Kazaa/