Knoppix was one of the first Linux LiveCDs which has must to do with it's enduring popularity. A a Debian-based Linux distro, Knoppix includes standard packages, such as Open Office and Firefox. Because the developers value stability, there is usually a great amount of time between releases of new version.
This guide to Knoppix will tell you how to use it, how to fine-tune it and how to deal with potential problems that arise from normal use. The resources on this page are suitable for users of all levels.
Image Credit: Knopper.net