Our sister blog Engadget found this pretty dang cool iPod hack. Somebody has hooked up an old NES controller for use with an iPod Photo to play Doom. As you can see on the original site, this involved adding a USB port to the bottom of his iPod to which the controller connects. And of course the software is courtesy of the iPod Linux folks (which we've mentioned before). Before you break out that soldering iron, make sure your iPod is supported.