I've been following a very interesting series of posts over on the Home Server Hacks blog. They detailing, step-by-step, the process of building a $400 "green" Home Server. The server is encased in a Shuttle KPC housing, which is, according to the Shuttle web site, a low power consumption appliance, using only 55 Watts when in use and 33 Watts when idle. To go even greener, you can use Western Digital Caviar GP series drives. There are five parts to this post about building the green WHS and you can began reading the series here. It's a great idea, and just in time for Earth Day, too!