That is a good one. One that I refer to often is http://www.geocities.com/delphius2002 which is Luther's Gorean Education Scrolls. The reason I recommend Luther is because he also goes into the backgrounds and cultures from which Norman derived Gor from. For instance, he derived heavily on Greek and Roman culture for the cities (obvviously) and even mentioned Sparta.
It just bears the question. Was the Greek philosopher Pythagoras teling the truth abotu a counter earth for real? Is there one out there?