GDM used to support the AutomaticLogin config option. We ended up dropping it in the rewrite, but some people were using it. We should probably add it back.
gdm-2.22.0-7.fc9 has been pushed to the Fedora 9 testing repository. If problems still persist, please make note of it in this bug report. If you want to test the update, you can install it with su -c 'yum --enablerepo=updates-testing update gdm'. You can provide feedback for this update here: http://admin.fedoraproject.org/updates/F9/FEDORA-2008-5719
gdm-2.22.0-8.fc9 has been pushed to the Fedora 9 stable repository. If problems still persist, please make note of it in this bug report.