Now that I am using Linux Mint 13, I get to use Ubuntu One again for auto syncing a folder. I already use Dropbox. With signing others up, I have 4.2 GB of space, which is about filled up. I have been waiting for Google to get their Linux Gdrive going, but that looks like it ain't coming. Today, I was reading about the upcoming Dell XPS 13 Project Sputnik which reminded me of Ubuntu One.
Now I have two automatically syncing folders with 9.2 GB (with Ubuntu One, you get 5 GB of free space.) of space. Sweet!
Of course, now I have to switch my two other computers to Linux Mint 13 from LMDE for this to be productive.