Sugarsync offers a cloud based service where you can save documents in the cloud and access them on a variety of devices.
Google Drive is a cloud based storage service that lets you store anything you like in the cloud and share with anyone you like. You can also create, edit and share documents, presentations, spreadsheet and more in real-time in the cloud.
Dropbox is a great site for storing files online and accessing them anywhere.
(Featured image: eugeniot)