Actually NAS is better known as Network Attached Storage. I currently use a 160GB Buffalo LinkStation and found it extremely easy to configure and use on a day-to-day basis.\n\nThe LinkStation is a network-attached storage device, but it also includes a print server, attachable via one of its two USB ports, and it creates a shared folder for use by anyone on your network. You can use the other USB port to attach an additional drive, but you have to format it with the LinkStation first.\n\nDisk performance is limited by the network. 100 megabits per second (which is only a quarter of the raw capability of USB 2.0) so almost all of the other devices that I looked at outperformed the LinkStation handily. But the convenience of having disk storage available to all of your PCs makes the slower speed bearable. Buffalo does not currently provide centralized backup software for the LinkStation, but I had no problem scheduling and initiating backups from individual PCs using Windows Backup. The network connection was more than adequate for streaming music, even to multiple PCs.\n\nI referenced the following sites when I was trying to make my choice\n\nhttp://www.pcmag.com/category2/0,1874,677853,00.asp\nhttp://reviews-zdnet.com.com/Buffalo_LinkStation_120GB/4505-3382_16-30639593.html\nhttp://www.tomsnetworking.com/Reviews-207-ProdID-HDHG250LAN.php