Maybe this is what you want. http://www.pendrivelinux.com/
Install your favorite Linux operating system on a flash drive or USB key no larger than your thumb (Thumb Drive). Your Portable Linux operating system can then be run from any computer that can boot from a USB flash device, allowing you to bring your entire operating system, desktop, applications, files, email, personal settings, favorites, games and more with you. Itís your own personal operating system you can carry in your pocket.
At Pendrivelinux, we provide simplified portable Linux flash drive installation tutorials and USB Linux installer scripts, making is easy for anyone to install, boot and run their favorite Linux from a flash pen drive!