Boy you to have been going at it for a long time. With the new LimeWire versions there is a way to effectively block shareaza users. But it pretty much blocks allot of others from connecting to you also. But in many hours of test actually days of test not one single shareaza client even showed up in my Q mostly LimeWire and a occasional bearshare.
But I do believe that this method of blocking would also hurt the Gnutella net especially those who are not running the most current versions of LimeWire. But if I found this method I am sure it will not be long before others figure it out and probably start implementing it.
At that point this discussion will become a mute point because there are allot of people who quite frankly believe shareaza users to be leaches and would love to be able to block them even if it hurt their own network.

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A little common sense goes a long way

Later Grandpa