Dropbox

Dropbox is a popular, and well implemented cloud-based storage and synchronisation tool. You have a 'Dropbox' (think folder) in the cloud, and can install the Dropbox software on as many PCs or mobile devices you like. Then if you update the Dropbox from any system, the changes are synchronised to all the others.

To get the full details why not just view their video:
https://www.dropbox.com/tour

It really is a great tool, and it is Free up to certain storage limit. You can also gain more free storage by completing the tutorial, and referring other people. As well as all that, it also has in-built version control, so that if you save an incorrect change, or delete a file by accident, you can still go back to the last good version.

Why wouldn't you want this tool!? :)

Feel free to sign-up direct via the above link, but if you want to sign up as my referral we'll both get an extra 250MB - http://db.tt/PQ8dObt

Enjoy!