Hello,
here is an easy installer which installs a bootstraped Debian "squeeze" Image on the internal flash (which will wipe MyDocs!)

https://github.com/DennisHeine/DebianOnN900

to set your wifi access data, edit /etc/wpa_supplicant/wpa_supplicant.cfg from within maemo (simply mount /dev/mmcbll0p1 somewhere)

root password is changeit

Flaws:
screen callibration is missing (you have to run set.sh manually from a terminal)
no phone is installed
no network manager is installed
fn-key not mapped yet
windowmanager is not autostarting

I'm currently working on an updated version to get those fixed.

Hope you like it,

Dennis