I don't agree. I believe that the major thing that Knoppix brought to the table was being able to run Linux right from CD, without having to install anything, without users having to "make room" for Linux. It gave a lot of people a chance to get some hands on use of Linux before the messy step of installing to hard disk.
i have to agree with harry here... knoppix is great, i give it to me friends so they dont get their hands too dirty... its great because no setup required... but, sometimes you have friends who get confused with the start up screen and start typing in commands to make it work?? (they never think of pressing enter)...

feather linux, is knoppix, almost naked... it still has a X....