Dropbox.com's slogan is simplify your life, and whilst this may be pushing it a bit, there is certainly some truth to it. As quoted from their website, "Any file you save to Dropbox also instantly saves to your computers, phones, and the Dropbox website."
Dropbox allows you to have your files everywhere, and be able to edit thehttp://www.blogger.com/img/blank.gifm from anywhere, whether online or not. A free user can store files up to 2GB and for $9.99/month you can save up to 50GB and $19.99 you can save up to 100GB.
The site boasts how easy it is to use and how safe your files will be. For a full list of features visit, Dropbox Features.