[maemo-developers] Unique serial number accessible programmatically on device?

[From: Tim Allen]

Hi all,

I'm developing on an N810 and it would be useful to be able to get
access to the device's serial number programmatically (or failing that
some other unique number like the Bluetooth MAC).

Can any point me in the right direction?  Is it available
in /sys/devices somewhere?  Seems like a maze to me!

Thanks,
Tim.