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.
The lite, free, version of this web service lets you create presentations and import them from either PowerPoint or Google Docs. There is also an iPad/iPhone app.
This free app combines the best of Panoramio and Google Maps into one app. Think of using this to export the settings of novels, the geography or culture of a historical location, or a virtual field trip.
While the Google Presentation in this post is intended for working with students who have hearing and visual impairments, some of the apps are valuable for an array of different learners.
This team of teachers from the National Teacher's Academy did an excellent presentation at the EdTechTeacher iPad Summit. This site lists some of their favorite tools, apps, and sites.