The Linutop is a small Linux PC. Of course, if you think the Mac Mini is small, then perhaps the words, incredibly miniscule are closer to the mark.
Running a customised version of xubuntu Linux, this little box could replace your desktop for most common tasks, including what you're doing right now.
And if this wasn't impressive enough in a box slightly larger than a Nintendo DS, the Linutop does it all drawing a maximum of 5 watts - That's less than an energy saver light bulb!
http://www.linuxlinks.com/portal/news/article.php?story=20071209192517608