All Macs, a hifi connected to an Airport Express, a couple of ATVs, a networked clock radio, as well as iPods/iPhones accessing the network. I understand that I can just put another NAS on the network and give everybody and everything access, but somebody mentioned that there are also iTunes servers on the market now (whatever that means). What are the advantages of and capabilities of these boxes? I am having a little trouble wrapping my head around how these would be used exactly. Can any of my hardware take advantage of them? Obviously the Macs can all run iTunes locally, so it's hard to see any advantage there over just accessing the files over the network from a plain old NAS. Any advantages with the ATV, Airport Express stereo, iPod Touch or iPhone? Any recommendations regarding either a good home server or just a good NAS drive much appreciated. Going to try to shop for it tomorrow.