I work with high school kids and I think Dropbox would be the way to go it's interactive and people can share videos, pictures, and files.. This would work well to stay connected with students and classroom assignments.
I have used dropbox very little. It was helpful. I recently took a class on Google and feel this is the best resource and way to share documents with students. It is very easy once you learn all that Google can do to help simplify your classes. I would recommend this and a class on Google to anyone.