UnionFS brings truly a revolution in the whole linux live CD world !

1) Older liveCD were both physically & logically read-only - allowing only some rescue operation to be made on PC.
2) Today's liveCDs are physically read-only but logically read-writeable - like Knoppix 3.8 - thanks to the revolutionary UnionFS technology.
3) Now imagine you have both physically & logically read-write liveCD - which allows you to work, customize install
and play at any location, at your friend's home, at work, anywhere !

I have an idea how to make step #3 happen - just listen:

On our liveCD we will have structure like this:
/
/OS
+
/ramdrive (virtual folder, not physically burned)

and we will mount /ramdrive over /OS to get into step 2.
But how will we make our CD truly modifiable - like in step 3?

The short answer is Multisession CDs !

The long answer is:
After the first session ends (i.e. you press restart -or- shutdown from KDE)
your /ramdrive must be written as session #2 as /Session2
right after restart - when knoppix boots it must union 3 filesystems
/OS (ro) + /Session2 (ro) + /ramdrive (rw)
so you have basically saved and continue your work from saved location !
Now, when you want to restart that session it, optionally, will be written as /Session3
and at the next boot the OS will union 4 directories:
/OS (ro) + /Session2 (ro) + /Session3 (ro) + /ramdrive (rw)

that's great - you have yust got your truly mobile OS, without expensive components
- such as mobile USB hard drives, flash disks, laptops, whatever ...
and if used on a mini DVD-R then will be compact and great !

what do you think ?
If you like the idea - then tell Klaus Knopper and other developers about that !