I have not been able to get root extended to my 512 memory card. I thought that creating the ext3 partition would be trivial, but was a bit of a nightmare. Tried parted with fc3 (installed), Ubuntu 5.X live, QTparted in fc3. Problem with parted was, that no ext3 was supported, and I tried with an extended partition, no file system in it and formatting that to an ext3, input/output error. Finally I created a 300 MB fat16 partition, left Linux and created a 200 MB ext3 partition, using Partition magic, in windows.
Now, as I at last have an ext3 partiton, I can't get the root.sh work for me. may be the ext3/windows is not suitable or maybe the memory card is faulty. I'm going to try with the 64 MB card that came with 770.

Wishes of some of us have been answered:

http://gparted.sourceforge.net/download.php

a really easy to use GPL Live CD-partitioning software (latest release 29.1)


edited: used gparted/sourceforge yesterday, partitioning was done in a minute. Ran Root.sh, did not work, reflashed, restored my settings, installed Xterm, ran Root.sh again. Now it worked. Created a 24 MB swap, opened a digitv -> mediaconverter->280x160 007-avi.file from mounted slug hdd through wlan. Film went on smoothly as watched on TV.

Thank's a lot for the instructions and great effort Wolfram!