Content management is a serious issue now. Content piles up, clogs search, and there is no automated way I know of to remove expired content. We are seeing platforms come on the scene with built in content expiration fields. When the content is posted the author has to add in the expiration date. You'll see this in the Brightcove video platform and the Percolate project management platform. This decreases maintenance hours and improves the user experience by removing the clutter.