Dropbox is running another promotion where anyone with an .edu email address can get 3, 8, 15 or 25GB if they sign up for the Campus Cup. The amount of free storage you get is dependant upon how many people from your school/university have signed up and completed the various 'challenges' associated with the promotion.
Enjoy!
Dropbox used to be generous cloud storage service 3 years ago but now their free quota is meh, M$ onedrive is now heaps better with much more generous quota and cross platform support has now catched up.