I just bought a Netgear RND2175 ReadyNAS Duo 750 GB Desktop Network Attached Storage from Amazon.com. I’ve been looking at these for a while, and finally decided on this one. The device holds 2 750gb drives which are mirrored for constant data redundancy. In addition, it runs an embedded version of Linux and can do pretty much anything a Linux computer can do. There’s an active user and developer community for help with every aspect of the system, including extending it and customizing it. Very exciting stuff!