This webpage allows you to transfer files of up to 2GB to another person. It's very simple to use - just upload the files and write the e-mail of the person you'd like to send them to. The files self-destruct after a two-week period, so they won't be floating around in a dropbox forever. Also, if security's an issue, you can encrypt the files using Androsa File Protector, and you can still send the files easily. I think this can be very useful for coordinations and exam work.

Great site with loads of videon quizzes. Multiple Choice questions on videos dealing with all types of topics. From beginner to high intermediate.