Quoting Walt Daniels <wdlists@optonline.net>:
Yes just admin logon would be nice. I have a site for a conference that is finished. I don't want to spend any time maintaining it. The next conference is in 2 years and will be run by someone else. Meanwhile the email addresses of those who registered will be useful to them so I want the site to remain visible to the world. I will apply security updates to it but nothing else.
If you just want to control whether the site data is updated or not just modify the access to create and edit for authenticated users. You probably want to allow the user to update their profile data to keep email addresses up to date. There is also the node access module[1] that allows you to assign accesses to certain nodes based on role that may give you options. [1] http://drupal.org/project/nodeaccess Earnie P.S. This is a support list question.