Allow the user to set an expiration date on their own listing, and for the admins to set an automatic expiration for all classified ads posted to a page.

Original post:

The ability to delete classified ads that are older than a set number of days.

We need to be able to keep it clean, so when ads get old, it would be good for them to automatically be deleted, rather than have the Admin person do it manually.

Keeping it fresh, keeps people interested.