you could use a permanent home on a usbstick, hddpartition...
check these linkis for more info

http://www.knoppix.net/wiki/Basic_Poor_Mans
http://www.knoppix.net/wiki/Using_FAQ
and under that:
9 Q: How do I save my preferences (language, UI...) when booting from CD? How do I restore them?)
13 Q: How do I use an USB memory stick to save myconfiguration?

then perhaps
How to install new programs when running from CDR?
http://www.knoppix.net/forum/viewtop...592&highlight=