This is a pretty cool design and neat idea. Here is a little from the article.
SheevaPlug draws 5 Watts, comes with Linux, and boasts completely open hardware and software designs
In typical use, the SheevaPlug draws about as much power as a night-light. Yet, with 512MB each of RAM and Flash, and a 1.2GHz CPU, the unobtrusive device approaches the computing power found in the servers of only a decade ago.
Here is the article:
http://linuxdevices.com/news/NS9634061300.html