Hi,
Just a note about gnome login screen;
You have to add user or set root password when first boot of Angstrom + Gnome (from narcissus).
Type "adduser <username>" in terminal (serial port). After that you can change password by "passwd <password>" command (as user) or you can use "passwd -d <username>" (as root) to delete password if you confuse about user password.
For set a password to root, type "passwd <password>" (as root).
