Robert --
I wrote a similar application with php4. It allows the user to update content, headline links and images through a user authenticated form -- backend uses MySQL.
Once the user submits the form data -- it is then saved and uploaded to the server
The testing status at this point is beta and I'm not sure if I want to release it yet. I may need some convincing. I do know of some other content managment tools available. Try www.hotsripts.com.
Hope this helps.
Mark