iPotato?

I'm sure you've seen nice little science experiments like the lemon-powered clock. Well, if you thought that was something (and even if you thought it was something ... lame), you are sure to be amazed by what the D116 gang have cooked up:

A Potato Powered Web Server!

Surf on over to their site for a detailed summary of the experiment and instructions for building your own Potato-Powered Server. They were actually running this thing for a while, but the potatoes have rotted away. So it is currently running on a single AAA battery (which, they claim, should power it for several years), making it -- in their words -- the World's Lowest Power Web Server.