I have three laptops, all running 12.04 (they were running 11.10). I have backups working to Ubuntu One for my primary laptop, and folder synchronization of my Documents, Pictures and Music folders working to all three laptops. I like the idea of being able to work on a document on my primary laptop, head out with a netbook and do some quick work on the same document, then finish it up on the third and not worry whether I grab a netbook, a low-end laptop or the bigger, heavier one.
I'd like to keep applications synchronized across all three laptops. I saw where you can do that using the Ubuntu Software Center, then click Installed, File and Synch between Computers. When I do that - I don't see my three laptops listed. When I log in to Ubuntu One - I see all three laptops. I can synch my folders just fine. Not sure how to synch my apps.