I have recently learned that Ubuntu One will be shutting down on June first, with data accessible for another 2 months after that. See Canonical's Post for more details ...
This is a little sad for me as I have enjoyed using the service and trusted Canonical with my data, a lot more than a great many other companies. So much so, that I wrote a plugin which allowed KDE users to access Ubuntu One through Dolphin. I intend to put an updated version of the plugin on the opendesktop.org which notifies users of this decision and I will pull the plugin on the first of June when the service goes down. The code will remain avaible under the MIT license on github if anyone wants to use it for their next cloud storage solution.
I want to thank all my users for being so nice when reporting feedback, be they bugs or compliments they were always polite and informed. I would also like to thank Canonical for a wonderfully reliable service and thank them for opensourcing the back-end now that they are shutting down said service.
I wish everyone the best of luck if finding a new cloud storage solution, I think I will be using this opportunity to switch to a service with client side encryption by default. I whole heartedly recommend others do the same.