Attn Graham Cobb, possible bug in notmynokia:

I've just been looking in /var/log/syslog (I'm not sure, but this file may only exist if you install the ksyslogd app). Near the top I see:

Nov 22 18:18:27 Nokia-N900-02-8 init: Unable to execute "/usr/sbin/NotMyNokia.sh" for notmynokia: No such file or directory
Nov 22 18:18:27 Nokia-N900-02-8 init: notmynokia main process (706) terminated with status 255

The file /usr/sbin/NotMyNokia.sh does exist, and is a symlink to /opt/maemo/usr/sbin/NotMyNokia.sh. Maybe /opt isn't mounted that early on in the start up sequence?