First open up /etc/pam.d/gdm in a Text Editor
the first two lines should look like
auth requisite pam_nologin.so
auth required pam_env.so
below them add the line below
auth sufficient pam_listfile.so item=user sense=allow file=/etc/X11/gdm/nopassusers onerr=fail
now in /etc/X11/gdm/ create a new text file called nopassusers
users that are to login without a password need their username on its own line in this file.
if you want 1 click login, (ala winxp) then change to a gdm theme with a facebrowser
such as http://www.gnome-look.org/content/show. ... tent=48213
SECURITY WARNING!!! DONT do this for the root account, or it will cause a puppy to develop aids and die!