Mmm, would be useful to be able to do it the other way. Really should be possible.

The /etc/ssh/sshd_config file on the N900 has X11Forwarding yes

Far as I can tell it's identical to the sshd_config file on Debian Lenny.

Vague thought would be to compile xauth for Maemo 5. Or perhaps xhost, though that wouldn't be very secure.

Also wonder about ssh -X user@N900 instead of root.

Have to give the user account a password. Or allow ssh logins without a password, perhaps.