To follow myself up...
The step I was missing was to ensure that I could ssh onto the zaurus and back without a password (there\'s a link on how to do this in the Multisync FAQ). I\'ve now managed to synchronise (at least partly the thing does not want to seem to receive all of my addressbook, only parts)... although I still cannot sync using root (just cannot persuade ssh to let me log in to Zaurus as root without a password), so I have had to sync as user zaurus and disable qcop (I don\'t mind restarting the Qtopia after sync, so that is not a problem).
If anyone has any idea about what I could be doing wrong to prevent root from ssh\'ing without password, I would appreciate it...