Ubuntu One

Ubuntu One screenshots

Ubuntu One allows you to store and share files in the Ubuntu One cloud storage
Accessing folders
Ubuntu One 4.2 : Accessing folders

Alternative downloads

Allway Sync
Synchronize data between PCs, USB drives, and online storage spaces.
Egnyte Desktop Sync
Desktop Sync ca create files on your computer and sync them to the cloud.
Store & Share
Synchronise all your files and back up your mobile contacts to the cloud.