When I buy my mac, after the expo, I still plan to keep the pc to run my pc programs. I want them to be networked and both have internet access. My cabel modem has both a ethernet and usb port to connect to the computer. My idea was, run an ethernet cabel from pc to mac, run a usb cabel from modem to mac, then have the mac share the internet with the pc. Would this work, or would I need a router/hub?