Free online backup, storage and filesharing.
I just love dropbox, it's a free tool to help you backup and share files over multiple platforms! Like windows, mac, linux, iphone and ipod touch app and the andriod version is on it's way!
Dropbox makes it very easy for you to view the files on your desktop and sync them with your mobile devices. On there website you'll find a short video that will explain it all. When you regisitrate you start with 2GB of space for free and you can expan that a little further in return for some promotion among your friends.
For those who need a lot of more space, which i can understand. Dropbox also offers paid accounts, for more information check out there website at www.dropbox.com