Dropbox together with Google Drive are probably the best cloud services available for us in education and for free. Of course both of them have paid upgrade options. Some of the things I like the most about these services is that they let you upload your files to folders accessible anywhere there's an Internet connection.These files can include — text documents, photographs, videos, music and more.
The tips below are taken from Mashable post entitled : 10 Things You did not Know Dropbox could Do. Check it out for more explanations on each of these tips.
1- Favorite files for offline reading
2- Email files to dropbox as attachments
3- Upload files to Dropbox via URL
4- Back up your website
5- Host web pages
6- Use Dropbox as your default memory folder