Hello - if you are planning on ordering OS X Leopard, I would ask that you consider pre-ordering it through our Amazon affiliate link. This is one of the few places that you can place a pre-order at this time.
I can answer a few questions just to get you started, kind of spread the answers out over a period of time. Depends. Most CDs will be hybrids, that will work with both Mac and PC. According to http://www.macgamer.com/wcgi-bin/ubb/ultimatebb.cgi?