A live distribution of Linux that clocks in around 200MB. Has 32-bit and 64-bit ports. Can be installed on any removable media, from an iPod to a CD. Basically, it's a version of Slackware optimized for use as a live distro. Modular - easily customized by installing or removing discrete modules. Has a community support module repository. Designed to boot faster than any other live distro. Even includes full X desktops if you want them. Can even be installed to your hard drive if that's how you roll.