I assume the normal live USB stick layout (dd'ed the ISO which was treated with isohybrid to the stick, then added a second partition with fdisk, if I plug in the stick it turns up as /dev/sdb1 and /dev/sdb2) for the following.
First, create the mountpoints and mount the "normal" ISO image:
# mkdir /mnt/iso /mnt/root /mnt/clic
# mount /dev/sdb1 /mnt/iso -oro
You'll now find the clicfs container on the mounted ISO fs:
# hexdump -C /mnt/iso/openSUSE-kde-11.2-livecd-kde-read-only.i686-2.8.0 |head -n 1
00000000 43 4c 49 43 30 32 0b 00 00 00 66 73 64 61 74 61 |CLIC02....fsdata|
Second, mount the clicfs:
# clicfs -c /dev/sdb2 /mnt/iso/openSUSE-kde-11.2-livecd-kde-read-only.i686-2.8.0 /mnt/clic/
# ls -l /mnt/clic/
-rw-r--r-- 1 root root 3891789824 Jan 1 1970 fsdata.ext3
Third, just loop mount the fsdata.ext3 file:
# mount /mnt/clic/fsdata.ext3 /mnt/root/ -oloop
That's it. You can now access all data that you stored on your Live stick under /mnt/root.
If you only want to have the "original" contents of the Live system, without the stuff you saved, then just replace the "-c /dev/sdb2" with "-m 128" which will use a ramdisk for the "write" part of the filesystem instead of the second partition on the stick. (Don't just leave off the "-c ..." without adding "-m", this got me a hanging mount later when I was trying the loop mount. I was able to resolve it with a brave "umount -f /mnt/clic" and then "killall -9 clicfs" though).
To get rid of it, just unmount it in reverse order:
# umount /mnt/root
# umount /mnt/clicfs
# umount /mnt/iso