A Networked Attached Storage (NAS) appliance can serve the purpose of a home file server, and do it by sipping only 20 watts of electricity. Some NAS devices have other value-added services like print servers, media servers, full-features web server, and other handy features that can easily replace a large noisy computer.
QNAP is one company that has several innovative NAS appliances on offer. Their TS-109 Pro NAS server has a ton of exciting features that cater to the home and small business user. The unit also has some nifty features to dynamically expand storage and copy data to the unit without a computer. Not only can the unit serve files, but it also has support as a Media Server for Playstation 3 and Xbox 360 consoles, in addition to all of the other standard NAS features.