u will need Extras-devel repository to enable it refer this link
http://wiki.maemo.org/Extras-devel
after wards open xterm and type

root
apt-get install nitdroid-installer

after this download this file and install using app manager
http://downloads.nitdroid.com/nitins....2.7_armel.deb

after installing open xterm and type nitdroid and follow the instructions.
after about 30 minutes (depending on ur internet connection) u will be dual booting android and maemo