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 don't know the answer to your question. You could, however, switch to one of the streaming formats so that you don't have to worry about this until a mac person can answer. I'm assuming you have broadband acccess though.