That's my other favourite gem.
But in all seriousness, I wish I could use Dropbox, but sadly where I live and work my ADSL upstream speed is 448kbit/s rendering it useless for anything other than very small files.
With docker being ported to the rasberry pi recently, I suspect it will be even simpler to set up an ownCloud for $35 + the cost of storage.
I used to use dropbox, but after running in on a bunch of devices and having to learn the quirks of each implementation and its sync hassles I left it. SFTP is simple, free, ubiquitous, and the words 'conflict resolution' never come up when I use it.
http://howto.cnet.com/8301-11310_39-57347395-285/how-to-map-...
In fact, one of the best things about Dropbox is that they worked very hard on removing any barriers, including making sure that it can be installed on a windows machine without requiring administrator privileges.
I am confident that a large percentage of their users would have been unable to use Dropbox had this issue not been addressed.