A question for those of you streaming content to your apple TV from an external drive hooked up to your mac: is your drive firewire or USB, and what are your experiences? I am asking cause i currently have a 750GB My Book hooked up to my iMac via firewire, and streaming to my apple TV works great. however, i need to add more storage and was thinking of switching to the USB route, but wanted some opinions first. Are any of you using USB drives hooked up to your mac to stream large libraries wirelessly to your apple TV with minimal skipping, buffering, etc? Any input is much appreciated. Thanks.