Just to give some good news:

-I have installed Ubunut 11.10
-and installed the omap libraries: https://wiki.ubuntu.com/ARM/OMAP/Graphics
- it's working good but now the unity is gone all I can get is a terminal with the ctrl+shift+t combination.
-I cannot install any apps after the libraries got installed
-the secondary charachters are not working on the keyboard (/ _ -)

- we really should make the charging possible as my N900 just shut down two times during the installations and tweaking beacause the battery was empty