This free app works with Gmail (and school Google Apps email accounts) to link attachments to cloud storage. Could be another piece to the workflow puzzle.
Present.me takes slide presentations from a variety of formats and then converts them so that you can record audio and then share via the cloud. It does work on mobile devices.
Many apps can share/copy to WebDAV. In fact, we have explored options of using Otixo as a cloud-based webDAV server. This free app seems to connect to an internally hosted WebDAV server for uploading/sharing files.
Create a story with text, images, and video from your camera roll, Dropbox, and the cloud. Scroll through to read online and share. Interesting free option.
This is a great use of the iPad! Document cameras are excellent: especially in elementary classrooms. Suzy Brooks, a teacher in Falmouth, MA, has excellent examples of this on her blog: 3rd Graders Dreaming Big (http://blogs.falmouth.k12.ma.us/simplysuzy/)