Even though Knoppix is cool and bitchin and everything, I have to say that Suse makes a trial version of their dist that runs off the cd, and its better than Knoppix. The first time you boot it, it sets up configuration files and allows you to select keyboard language, screen resolution and root accout. Its simply better than Knoppix. You can download it here:
http://www.linuxiso.org/distro.php?distro=2