Dropbox is a great cloud based service for backing up and syncing important documents/files across multiple computers. It works across multiple platforms such as the Mac OSX, Windows and Linux on the computer side and the iPhone app for the mobile size with a blackberry app and android app coming soon. Although a mobile version of the web-end is available at m.dropbox.com
Dropbox offers 2GBs of free storage with the option to add additional storage for a small monthly fee. With this service you can and a smartphone with data, you can carry all your important documents without having to manually transfer. I believe the option to edit will allow for better use of the app, such as being able to edit it on the smartphone and having it synced automatically with all your computers so you’ll have the latest version of the file wherever you have a connection.
I highly recommend Dropbox to everyone to try out here