Knowing that the new Mac OSX Leopard is leaping its way to the market but my main concern is, how is that going to affect Tiger? Or not? As we have our setting done on certain applications eg. custom icon. Will that remain the same after we upgraded to Leopard? Or do we need to backup whatever we have in Tiger before we do the upgrade? I couldn't be more happier to have my OS upgraded but I also need to know how much will it affect the current OS and how to do go bout upgrading it? Pop it the OS cd and let it do its magic or is there gonna be lots of procedures? By the way, I am running my PB 164 Ghz on 10.4.10.