Time sensitive Dropbox Shared Links — There's a Workflow for That.
Once upon a time, our intrepid hero discovered Dropshare for Mac. Awestruck by the flexibility and independence it provided him, he promptly eschewed using services such as Cloudapp and Droplr (despite their greatness and coveted position in the King's court).
But as powerful and versatile as Dropshare was, it lacked a feature our hero envied, one essential for those times all he really needed was to quickly share an ephemeral file or screen-shot with a friend or foe — Time Sensitive shared links.