Just have to vocalize my sheer joy. For about the last week, I have been trying to make my USB disk accessible over the Internet via "back to my Mac" with no success. I even called AppleCare who reluctantly tried to help me. I gave up after AppleCare told me there needed to be a "computer" at "home" to facilitate the connection. Ergo, I thought what I was trying to do was impossible. Well, I guess the true issue was my USB disk. I was using a cheap enclosure on a WD 640gb. I switched to a BlacX USB slot and 1TB WD green drive, and now... it WORKS! I am listening to my extensive, 600gb music library that I have at home, AT WORK. WOO HOO. I love my Mac.