The Periodic Content Delivery System (PCDS) was my project for my CS Senior Project course in college. It is not likely to be updated in the future, but it is released under the terms of the GNU General Public License if you want to use or modify it.
PCDS was designed to help manage a web page which needs to be updated at regular intervals, such as a comic strip. It lets you enqueue content for the future, publishes content from the queue at the appropriate time, and provides a Perl CGI script for accessing older content. The appearance of the display page is almost completely customizeable.
Version 0.90 is lacking and may be slightly broken. Use 0.91; it's mostly functional. You still have to write your own .pcdsrc file and you have to manage it & add users manually.
PCDS HAS NO WARRANTY, EXPRESSED OR IMPLIED. I don't recommend that you use it for anything important. I don't guarantee that it will work on your system, or anywhere. If bad things happen when you use it, don't say I didn't warn you.
(That said, if you're having trouble, feel free to e-mail me. I may be able to provide informal support for non-complex problems.)