If you look at /etc/init.d/keymap.sh in line 22 you should see this:

loadkeys /usr/share/keymaps/i386/qwerty/us.kmap.gz

edit the file so it has the italian keymap listed:

loadkeys /usr/share/keymaps/i386/qwerty/it.kmap.gz

save the file and then reload the keymap with the following command:

/etc/init.d/keymap.sh reload

If you still have problems there are 2 or 3 other italian keymaps listed in /usr/share/keymaps/i386/qwerty (that is if you have a qwerty keyboard, if it is another layout look in that directory).

HTH

rock