Drop is a simple way to share files faster and safer. It encrypts your data and deletes the files after 24 hours, leaving no digital footprint.
ScoutDocs adds secure file-sharing to WordPress. Files are stored safely in the cloud, and when you share them, the e-mail notification is delivered by the ScoutDocs service, so you'll know it'll arrive. You can assign files to people by e-mail address or existing WordPress account, or create groups of people and send files to the group.