Hitachi makes a NAS head under the name SimpleTech, it's got ethernet and two USB ports and has fully open source software.<p>It runs on a little startech ARM SOC and once you get a cross compilation toolchain set up, it's easy to run stuff on it by loading from a usb drive.<p><a href="http://www.simpletech.com/products/storage/simplenet/simplenet.php" rel="nofollow">http://www.simpletech.com/products/storage/simplenet/simplen...</a><p>I can remember having laptops less powerful than these units, so they are roomy and fast by the standards of most embedded developers. But for prototyping stuff they are excellent.