This app is a great workflow solution for turning in assignments. It allows your students to turn in their work from any app that allows for WebDAV use (Pages, Keynote, Numbers, iAnnotate, iThoughtsHD - to name a few). The students can turn in work easily to their own folders and teachers can open it either on another iPad or computer to give written or oral feedback - then return it to the student. The service creates a partitioned folder so as not to overwrite student work and make it clear to kids when they receive feedback. And, it's free.