“You’re at the coffee shop. You need to access a file that has information about your work, but as you attempt to find the file you realize that you’ve made a mistake. You saved the work on your desktop computer, but you only have your laptop with you. You have no way to access the file.
Enter Dropbox. This program acts as a “magic pocket” which is always with you and contains whatever you place in it. Put a file into your Dropbox and it’s on all of your computers and mobile devices.
But there’s more to Dropbox: you can use it for file sharing, backing up your data, syncing files between computers and even remotely control your computer.” Source: DOWNLOAD The First Unofficial Guide To Dropbox
Bright, shiny objects! 
What do you think?