Unix The e-Classifieds Free Edition allows you to quickly set up your own classifieds section using easily configurable categories and other variables. All pages are generated dynamically using your settings, so there is no need to manually edit any HTML files.
Users can post and delete their own ads.
The admin can delete any ad posted by any user and can even delete entire categories at a time. Well documented for basic configurations but may take a bit to customize it beyond the basics. Inside frames was a problem for a bit but very doable. We have searched the entire web for a good classified script and we found it it here. Can't wait to try the photo edition, it looks tops.