Not sure I understand the site model.
Do you want others to be able to add content? If so...a content management system is what you want.
There are several in open source that do an excellent job.
There's a bit of a learning curve but they are very powerful programs that would allow others to add content to the site.
Joomla and Drupal are the top 2 in most peoples opinion.

Give us more info on your ideas and we can better offer suggestions.