Dropbox is great to store documents and allow sharing among a group of students without regard to type of device that needs to access. You can get to Dropbox files from a PC, MAC, iPad, and/or tablet.
How I Use It
I store all of my personal files so I can access from school and home without having to worry about a flash drive or syncing to the most current version. Students use it the same way as well as being able to collaborate on projects.