DriveDroid is an interesting utility that allows you to turn your Android device into a bootable Linux drive for your desktop PC using ISO or IMG files downloaded to your phone. Your phone can serve as a repository or workshop for Linux distributions that you want to try out, or a bootable rescue disk. It won't work with all distributions, but DriveDroid is a pretty neat utility if you like to tinker around with Linux systems or just want a backup system lying around.