Extend the expiration process to the media files
Example : a teacher says to his students that a pdf files in on the site until...that date. When the specific date is over, the file must disappear.
Or you have until that date to fill the request for a grant, and so on.
There are two other suggestion threads for this same feature, if the votes are all added up, that places it #6 most requested. ;)
Likewise. In our client's case, expiration is often used for tender documents which should be removed from the the site so that Google search results no longer provide the documents, etc.