Sounds pretty sweet, man. From what I've read, what it does is it works like a server. You show it what Movies / Music you want to store on it on your home PC, then you can access them anywhere from the web with a high-speed connection. So your friends can listen to your music on your PC from their house, or even movies. Check it out, sounds intresting.
http://www.divx.com/divx/mastermind/