Try this maybe, I have not tried booting it on N900 but, it might boot with touchscreen and keys. I was working with Mavrick Kubuntu on a Pandora keys and touchscreen work. Prior to this I was able to load MohammadAG's 9.10 rootfs on the Pandora and had keys and screen on the Pandora so...... This might help someone.

http://helix.fantasyland.com/xopher/...pandora.tar.gz

login: root
passwd:zzz
Size:570MB
Size on Card: Approx. 1.5GB
openssh-server is installed

It is definitely flakey on the Pandora, I don't expect it to be behave differently on N900.

If it provides progress I wouldn't mind if someone mirrored it.

EDIT: You most likely have to drop the N900's modules and firmwares into the extracted filesystem before booting.