Ubuntu One : Store, Sync & Share
ubuntuone.com
ubuntuone.com
-elliot https://launchpad.net/~statik/
*edit: My bad. I googled for 'ubuntuone license' and the excerpt said it was proprietary. The Launchpad page now says GPLv3. No code released yet, but I'm sure it will follow as the project goes public:
I'd imagine that this will stay Ubuntu-exclusive and will start to act as a 'your-computer-in-the-cloud' sort of thing where you can plug your Ubuntu device into the network and have all of your apps and data instantly available.
Ubuntu-only-ness will let the dev team concentrate on making sure that the default Ubuntu apps will sync perfectly and it's open-source nature will let people write other clients that concentrate on other devices.
FWIW, this is all wild speculation. I think that Shuttleworth already knows what the market is like and I'm sure he's taken Dropbox/rsync-users into account.
All you gotta do is wrap your stuff in encrypted zips and dump the passwords where the links are.