This is a topic not covered much for some reason. those that create large blog networks know that you want to leave as little a footprint as possible that all your blogs are related. Anyone do much testing in this area? Here are some basics, 1) Separate C-Class Hosting. 2) Private Who-is Information on the domain. 3) Varying patterns in your out bound links. What other elements can you think of? Hopefully this will help everyone keep G off their tail.